{"title":"Sprindex","description":null,"products":[{"product_id":"sprindex-shock-spring-sprindex-downhill-290-320-lbs-1","title":"Shock Spring Sprindex Downhill 290-320 lbs","description":"\u003cp\u003eSPRINDEX ALLOWS FOR TOOL-FREE, EASY ADJUSTMENT OF YOUR COIL'S SPRING RATE. Adjusting your shock's spring rate can profoundly improve your bike's handling and suspension. In fact, you may find yourself using different spring rates for different trails, depending on the conditions and type of trail. Or you may increase your spring rate for long climbs and decrease it for down hills. No expense was spared on the materials or manufacturing processed used. The coil itself is made of super high tensile spring steel similar to \"lightweight\" springs (which is why Sprindex is lighter than regular springs) in order to handle the stress of the system when adjusted to its highest spring rate setting, as well as reduce coil mass. The Sprindex assembly is made of glass reinforced polymer. The 5 included adapters are made of slippery Delrin. Spring rate is the force required to move a spring a given distance and independent of preload. For example, a \"400 lb\/in\" spring requires 400 pounds to move the spring 1 inch and 800 pounds to move a spring 2 inches. Preload is how much force is required to start moving the spring. Sprindex is patent pending in many countries. Follow your shock manufacturer's instructions for preload amount and sag and other shock adjustments. Do not preload your Sprindex more than 3 turns and 1 to 2 turns is preferred. Your Sprindex coil behaves like a regular coil that has a spring rate the same as your adjusted Sprindex spring rate. Adjusting your Sprindex does not change the length of the coil and so does not change your preload. Preload is adjusted normally and with the threaded ring that came with your shock. HOW DOES SPRINDEX ADJUST SPRING RATE? The spring rate of a spring is the amount of force it takes to deflect the spring a certain distance (typically pounds per inch or Newtons per mm). Spring rate is a function of 4 characteristics: wire diameter, coil diameter, material, and number of active coils. More active coils causes a lower spring rate and fewer active coils causes a higher spring rate. Think of it like this: the less wire there is to bend, the stiffer the spring. By twisting the Dial, Sprindex works by altering the number of active coils available for deflection. The adjusted spring rate is displayed through a window in the Dial. COIL SHOCKS VERSUS AIR SHOCKS Most agree that coil shocks outperform air shocks, assuming the right spring rate for the particular rider. Air shocks have significant \"stiction\" which is friction that resists the shock's initial movement. Coil shocks have much less stiction. Coil shocks soak up small bumps much better, better tire contact with the ground, give better traction, better ride quality, and make a rider measurably faster. So why are air shocks more common? The answer is lack of adjustability for coils and weight. Traditional coils have a fixed spring rate and spring rate has a dramatic effect on riding performance and feel. Most people ride the wrong spring rate because springs are typically only available in wide increments. Spring rate has a profound effect on bike performance. Coil shocks also weigh more than air shocks, but when using the right spring rate, the small weight penalty is easily worth it. Besides, Sprindex is lighter than ordinary shock springs. SPRING RATE IS DIFFERENT FROM PRELOAD Coil shocks include a threaded ring for preloading the coil. However, preloading is not the same as using a stiffer (higher spring rate) spring. Sprindex Preload A sprindex coil behaves exactly like a regular coil of the selected spring rate. For example, Sprindex adjusted to 435 lb\/in behaves just like a custom made 435 lb\/in standard coil. Poor small bump absorption resulting in a harsh ride and poor traction because it increases force to start coil movement. Either reduces shock travel and\/or over-stresses spring. Improper SAG. SAG must be achieved by spring rate, not preload. Doesn't change coil spring rate. If you bottom out with a spring, heavy preloading may not solve this and will mess up the rest of the stroke. Mountain bike shocks are designed for as little preload as is necessary to take play out of the system. Any more preload than this harms ride performance. SPRINDEX IS PROGRESSIVE Besides having an adjustable spring rate, Sprindex is also progressive. Sprindex is specifically designed to have a progressive spring rate for the last 20% of stroke for big hit support and for bikes with a linear linkage design. Coil versus Air: A coil is usually very linear, whereas an air shock starts out Regressive (a reducing spring rate), and then turns progressive (an increasing spring rate). See the chart below. One of the disadvantages to using an Air shock is that its regressiveness mean less small bump sensitivity and traction. This is partly why Air shocks are not as plush as Coil. Regardless of your bike's suspension design, Sprindex being linear between about 0-80% stroke and progressive between about 80% and 100% stroke works great because it provides unbeatable sensitivity and traction through all the small and medium movement and it provides progressive support for big hits. Most importantly, Sprindex also provides spring rate adjustment in order to fine tune the perfect spring rate so that you maximize your suspension performance. Performance Adapters Performance Adapters are included. Sprindex coils fit a wide variety of shocks, but you must use the Performance Adapters for most of them. Our Performance Adapters both improve the fit between the coil and your shock and are made of low friction Delrin to improve shock performance by allowing the spring to twist during high deflection. Also, the Performance Adapters help prevent the preload ring from self-adjusting due to coil windup. See bottom of Performance Adapter for instruction of which Performance Adapter you should use. For Rockshox, no Performance Adapter is required but we recommend you use the Performance Washer adapter for shock performance and to help prevent preload self-adjustment.\u003c\/p\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748550938672,"sku":"SD60300-RP","price":269.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/Shock_Spring_Sprindex_Downhill_Model_Range_290-320_lbs.jpg?v=1791294408"},{"product_id":"sprindex-shock-spring-sprindex-downhill-450-490-lbs-1","title":"Shock Spring Sprindex Downhill 450-490 lbs","description":"\u003cp\u003eSPRINDEX ALLOWS FOR TOOL-FREE, EASY ADJUSTMENT OF YOUR COIL'S SPRING RATE. Adjusting your shock's spring rate can profoundly improve your bike's handling and suspension. In fact, you may find yourself using different spring rates for different trails, depending on the conditions and type of trail. Or you may increase your spring rate for long climbs and decrease it for down hills. No expense was spared on the materials or manufacturing processed used. The coil itself is made of super high tensile spring steel similar to \"lightweight\" springs (which is why Sprindex is lighter than regular springs) in order to handle the stress of the system when adjusted to its highest spring rate setting, as well as reduce coil mass. The Sprindex assembly is made of glass reinforced polymer. The 5 included adapters are made of slippery Delrin. Spring rate is the force required to move a spring a given distance and independent of preload. For example, a \"400 lb\/in\" spring requires 400 pounds to move the spring 1 inch and 800 pounds to move a spring 2 inches. Preload is how much force is required to start moving the spring. Sprindex is patent pending in many countries. Follow your shock manufacturer's instructions for preload amount and sag and other shock adjustments. Do not preload your Sprindex more than 3 turns and 1 to 2 turns is preferred. Your Sprindex coil behaves like a regular coil that has a spring rate the same as your adjusted Sprindex spring rate. Adjusting your Sprindex does not change the length of the coil and so does not change your preload. Preload is adjusted normally and with the threaded ring that came with your shock. HOW DOES SPRINDEX ADJUST SPRING RATE? The spring rate of a spring is the amount of force it takes to deflect the spring a certain distance (typically pounds per inch or Newtons per mm). Spring rate is a function of 4 characteristics: wire diameter, coil diameter, material, and number of active coils. More active coils causes a lower spring rate and fewer active coils causes a higher spring rate. Think of it like this: the less wire there is to bend, the stiffer the spring. By twisting the Dial, Sprindex works by altering the number of active coils available for deflection. The adjusted spring rate is displayed through a window in the Dial. COIL SHOCKS VERSUS AIR SHOCKS Most agree that coil shocks outperform air shocks, assuming the right spring rate for the particular rider. Air shocks have significant \"stiction\" which is friction that resists the shock's initial movement. Coil shocks have much less stiction. Coil shocks soak up small bumps much better, better tire contact with the ground, give better traction, better ride quality, and make a rider measurably faster. So why are air shocks more common? The answer is lack of adjustability for coils and weight. Traditional coils have a fixed spring rate and spring rate has a dramatic effect on riding performance and feel. Most people ride the wrong spring rate because springs are typically only available in wide increments. Spring rate has a profound effect on bike performance. Coil shocks also weigh more than air shocks, but when using the right spring rate, the small weight penalty is easily worth it. Besides, Sprindex is lighter than ordinary shock springs. SPRING RATE IS DIFFERENT FROM PRELOAD Coil shocks include a threaded ring for preloading the coil. However, preloading is not the same as using a stiffer (higher spring rate) spring. Sprindex Preload A sprindex coil behaves exactly like a regular coil of the selected spring rate. For example, Sprindex adjusted to 435 lb\/in behaves just like a custom made 435 lb\/in standard coil. Poor small bump absorption resulting in a harsh ride and poor traction because it increases force to start coil movement. Either reduces shock travel and\/or over-stresses spring. Improper SAG. SAG must be achieved by spring rate, not preload. Doesn't change coil spring rate. If you bottom out with a spring, heavy preloading may not solve this and will mess up the rest of the stroke. Mountain bike shocks are designed for as little preload as is necessary to take play out of the system. Any more preload than this harms ride performance. SPRINDEX IS PROGRESSIVE Besides having an adjustable spring rate, Sprindex is also progressive. Sprindex is specifically designed to have a progressive spring rate for the last 20% of stroke for big hit support and for bikes with a linear linkage design. Coil versus Air: A coil is usually very linear, whereas an air shock starts out Regressive (a reducing spring rate), and then turns progressive (an increasing spring rate). See the chart below. One of the disadvantages to using an Air shock is that its regressiveness mean less small bump sensitivity and traction. This is partly why Air shocks are not as plush as Coil. Regardless of your bike's suspension design, Sprindex being linear between about 0-80% stroke and progressive between about 80% and 100% stroke works great because it provides unbeatable sensitivity and traction through all the small and medium movement and it provides progressive support for big hits. Most importantly, Sprindex also provides spring rate adjustment in order to fine tune the perfect spring rate so that you maximize your suspension performance. Performance Adapters Performance Adapters are included. Sprindex coils fit a wide variety of shocks, but you must use the Performance Adapters for most of them. Our Performance Adapters both improve the fit between the coil and your shock and are made of low friction Delrin to improve shock performance by allowing the spring to twist during high deflection. Also, the Performance Adapters help prevent the preload ring from self-adjusting due to coil windup. See bottom of Performance Adapter for instruction of which Performance Adapter you should use. For Rockshox, no Performance Adapter is required but we recommend you use the Performance Washer adapter for shock performance and to help prevent preload self-adjustment.\u003c\/p\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748550971440,"sku":"SD60450-RP","price":269.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/Shock_Spring_Sprindex_Downhill_Model_Range_450-490_lbs.jpg?v=1791294409"},{"product_id":"sprindex-shock-spring-sprindex-downhill-490-560-lbs","title":"Shock Spring Sprindex Downhill 490-560 lbs","description":"\u003cp\u003e\u003cstrong\u003eSprindex Adjustable Downhill Coil Spring (490–560 lbs \/ 75mm Stroke)\u003c\/strong\u003e\u003c\/p\u003e\r\n\u003cp\u003eAchieve the ultimate rear suspension setup without the hassle of swapping traditional coils. The Sprindex Downhill Coil Spring brings tool-free, micro-adjustable spring rate tuning to your coil shock, allowing you to fine-tune your sag, adapt to changing trail conditions, or stiffen your rate for long climbs. Engineered from super high-tensile spring steel and lightweight glass-reinforced polymer, Sprindex delivers custom coil performance in a lightweight package.\u003c\/p\u003e\r\n\u003ch3\u003eHow Sprindex Works\u003c\/h3\u003e\r\n\u003cp\u003eSpring rate is determined by active coil length. By turning the Sprindex dial, the system alters the number of active coils available for deflection—adjusting your spring rate without changing coil length or affecting your preload setting. The selected spring rate is clearly displayed through the window on the dial, giving you precise control over your suspension's performance.\u003c\/p\u003e\r\n\u003ch3\u003eProgressive End-Stroke Support\u003c\/h3\u003e\r\n\u003cp\u003eWhile traditional coils are strictly linear, Sprindex features a progressive spring rate through the final 20% of its stroke (80–100%). This provides supple small-bump traction and plushness through the initial travel, combined with ramped-up bottom-out resistance for big hits, heavy drops, and linear frame linkages.\u003c\/p\u003e\r\n\u003ch3\u003eKey Features\u003c\/h3\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eTool-Free Adjustment:\u003c\/strong\u003e Easily turn the dial to adjust spring rate anywhere between 490 lbs\/in and 560 lbs\/in.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eSuper High-Tensile Steel:\u003c\/strong\u003e Stronger and lighter than standard coil springs, reducing overall coil mass while handling high stress.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eLow-Friction Delrin Adapters:\u003c\/strong\u003e Includes 5 performance adapters to ensure smooth fitment across a wide range of shock models while preventing coil-windup and preload ring self-adjustment.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eIndependent Preload:\u003c\/strong\u003e Adjusting spring rate does not affect preload, ensuring your sag is always achieved through proper rate rather than excessive preloading.\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eSpring Rate Range:\u003c\/strong\u003e 490–560 lbs\/in (micro-adjustable)\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eStroke:\u003c\/strong\u003e 75 mm\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eLength (without adapters):\u003c\/strong\u003e 160 mm\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 563 g\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Super high-tensile steel coil, glass-reinforced polymer dial assembly, Delrin adapters\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits most major coil shock brands using included adapters (RockShox performance washer included)\u003c\/li\u003e\r\n\u003c\/ul\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748551102512,"sku":"SD60500-RP","price":269.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/75mm_Sprindex_Black.jpg?v=1791294409"},{"product_id":"sprindex-shock-spring-sprindex-downhill-570-630-lbs-1","title":"Shock Spring Sprindex Downhill 570-630 lbs","description":"\u003cp\u003eSPRINDEX ALLOWS FOR TOOL-FREE, EASY ADJUSTMENT OF YOUR COIL'S SPRING RATE. Adjusting your shock's spring rate can profoundly improve your bike's handling and suspension. In fact, you may find yourself using different spring rates for different trails, depending on the conditions and type of trail. Or you may increase your spring rate for long climbs and decrease it for down hills. No expense was spared on the materials or manufacturing processed used. The coil itself is made of super high tensile spring steel similar to \"lightweight\" springs (which is why Sprindex is lighter than regular springs) in order to handle the stress of the system when adjusted to its highest spring rate setting, as well as reduce coil mass. The Sprindex assembly is made of glass reinforced polymer. The 5 included adapters are made of slippery Delrin. Spring rate is the force required to move a spring a given distance and independent of preload. For example, a \"400 lb\/in\" spring requires 400 pounds to move the spring 1 inch and 800 pounds to move a spring 2 inches. Preload is how much force is required to start moving the spring. Sprindex is patent pending in many countries. Follow your shock manufacturer's instructions for preload amount and sag and other shock adjustments. Do not preload your Sprindex more than 3 turns and 1 to 2 turns is preferred. Your Sprindex coil behaves like a regular coil that has a spring rate the same as your adjusted Sprindex spring rate. Adjusting your Sprindex does not change the length of the coil and so does not change your preload. Preload is adjusted normally and with the threaded ring that came with your shock. HOW DOES SPRINDEX ADJUST SPRING RATE? The spring rate of a spring is the amount of force it takes to deflect the spring a certain distance (typically pounds per inch or Newtons per mm). Spring rate is a function of 4 characteristics: wire diameter, coil diameter, material, and number of active coils. More active coils causes a lower spring rate and fewer active coils causes a higher spring rate. Think of it like this: the less wire there is to bend, the stiffer the spring. By twisting the Dial, Sprindex works by altering the number of active coils available for deflection. The adjusted spring rate is displayed through a window in the Dial. COIL SHOCKS VERSUS AIR SHOCKS Most agree that coil shocks outperform air shocks, assuming the right spring rate for the particular rider. Air shocks have significant \"stiction\" which is friction that resists the shock's initial movement. Coil shocks have much less stiction. Coil shocks soak up small bumps much better, better tire contact with the ground, give better traction, better ride quality, and make a rider measurably faster. So why are air shocks more common? The answer is lack of adjustability for coils and weight. Traditional coils have a fixed spring rate and spring rate has a dramatic effect on riding performance and feel. Most people ride the wrong spring rate because springs are typically only available in wide increments. Spring rate has a profound effect on bike performance. Coil shocks also weigh more than air shocks, but when using the right spring rate, the small weight penalty is easily worth it. Besides, Sprindex is lighter than ordinary shock springs. SPRING RATE IS DIFFERENT FROM PRELOAD Coil shocks include a threaded ring for preloading the coil. However, preloading is not the same as using a stiffer (higher spring rate) spring. Sprindex Preload A sprindex coil behaves exactly like a regular coil of the selected spring rate. For example, Sprindex adjusted to 435 lb\/in behaves just like a custom made 435 lb\/in standard coil. Poor small bump absorption resulting in a harsh ride and poor traction because it increases force to start coil movement. Either reduces shock travel and\/or over-stresses spring. Improper SAG. SAG must be achieved by spring rate, not preload. Doesn't change coil spring rate. If you bottom out with a spring, heavy preloading may not solve this and will mess up the rest of the stroke. Mountain bike shocks are designed for as little preload as is necessary to take play out of the system. Any more preload than this harms ride performance. SPRINDEX IS PROGRESSIVE Besides having an adjustable spring rate, Sprindex is also progressive. Sprindex is specifically designed to have a progressive spring rate for the last 20% of stroke for big hit support and for bikes with a linear linkage design. Coil versus Air: A coil is usually very linear, whereas an air shock starts out Regressive (a reducing spring rate), and then turns progressive (an increasing spring rate). See the chart below. One of the disadvantages to using an Air shock is that its regressiveness mean less small bump sensitivity and traction. This is partly why Air shocks are not as plush as Coil. Regardless of your bike's suspension design, Sprindex being linear between about 0-80% stroke and progressive between about 80% and 100% stroke works great because it provides unbeatable sensitivity and traction through all the small and medium movement and it provides progressive support for big hits. Most importantly, Sprindex also provides spring rate adjustment in order to fine tune the perfect spring rate so that you maximize your suspension performance. Performance Adapters Performance Adapters are included. Sprindex coils fit a wide variety of shocks, but you must use the Performance Adapters for most of them. Our Performance Adapters both improve the fit between the coil and your shock and are made of low friction Delrin to improve shock performance by allowing the spring to twist during high deflection. Also, the Performance Adapters help prevent the preload ring from self-adjusting due to coil windup. See bottom of Performance Adapter for instruction of which Performance Adapter you should use. For Rockshox, no Performance Adapter is required but we recommend you use the Performance Washer adapter for shock performance and to help prevent preload self-adjustment.\u003c\/p\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748551135280,"sku":"SD60550-RP","price":269.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/Shock_Spring_Sprindex_Downhill_Model_Range_570-630_lbs.jpg?v=1791294410"},{"product_id":"sprindex-shock-spring-sprindex-light-trail-380-430-lbs-1","title":"Shock Spring Sprindex Light Trail 380-430 lbs","description":"\u003cp\u003eSPRINDEX ALLOWS FOR TOOL-FREE, EASY ADJUSTMENT OF YOUR COIL'S SPRING RATE. Adjusting your shock's spring rate can profoundly improve your bike's handling and suspension. In fact, you may find yourself using different spring rates for different trails, depending on the conditions and type of trail. Or you may increase your spring rate for long climbs and decrease it for down hills. No expense was spared on the materials or manufacturing processed used. The coil itself is made of super high tensile spring steel similar to \"lightweight\" springs (which is why Sprindex is lighter than regular springs) in order to handle the stress of the system when adjusted to its highest spring rate setting, as well as reduce coil mass. The Sprindex assembly is made of glass reinforced polymer. The 5 included adapters are made of slippery Delrin. Spring rate is the force required to move a spring a given distance and independent of preload. For example, a \"400 lb\/in\" spring requires 400 pounds to move the spring 1 inch and 800 pounds to move a spring 2 inches. Preload is how much force is required to start moving the spring. Sprindex is patent pending in many countries. Follow your shock manufacturer's instructions for preload amount and sag and other shock adjustments. Do not preload your Sprindex more than 3 turns and 1 to 2 turns is preferred. Your Sprindex coil behaves like a regular coil that has a spring rate the same as your adjusted Sprindex spring rate. Adjusting your Sprindex does not change the length of the coil and so does not change your preload. Preload is adjusted normally and with the threaded ring that came with your shock. HOW DOES SPRINDEX ADJUST SPRING RATE? The spring rate of a spring is the amount of force it takes to deflect the spring a certain distance (typically pounds per inch or Newtons per mm). Spring rate is a function of 4 characteristics: wire diameter, coil diameter, material, and number of active coils. More active coils causes a lower spring rate and fewer active coils causes a higher spring rate. Think of it like this: the less wire there is to bend, the stiffer the spring. By twisting the Dial, Sprindex works by altering the number of active coils available for deflection. The adjusted spring rate is displayed through a window in the Dial. COIL SHOCKS VERSUS AIR SHOCKS Most agree that coil shocks outperform air shocks, assuming the right spring rate for the particular rider. Air shocks have significant \"stiction\" which is friction that resists the shock's initial movement. Coil shocks have much less stiction. Coil shocks soak up small bumps much better, better tire contact with the ground, give better traction, better ride quality, and make a rider measurably faster. So why are air shocks more common? The answer is lack of adjustability for coils and weight. Traditional coils have a fixed spring rate and spring rate has a dramatic effect on riding performance and feel. Most people ride the wrong spring rate because springs are typically only available in wide increments. Spring rate has a profound effect on bike performance. Coil shocks also weigh more than air shocks, but when using the right spring rate, the small weight penalty is easily worth it. Besides, Sprindex is lighter than ordinary shock springs. SPRING RATE IS DIFFERENT FROM PRELOAD Coil shocks include a threaded ring for preloading the coil. However, preloading is not the same as using a stiffer (higher spring rate) spring. Sprindex Preload A sprindex coil behaves exactly like a regular coil of the selected spring rate. For example, Sprindex adjusted to 435 lb\/in behaves just like a custom made 435 lb\/in standard coil. Poor small bump absorption resulting in a harsh ride and poor traction because it increases force to start coil movement. Either reduces shock travel and\/or over-stresses spring. Improper SAG. SAG must be achieved by spring rate, not preload. Doesn't change coil spring rate. If you bottom out with a spring, heavy preloading may not solve this and will mess up the rest of the stroke. Mountain bike shocks are designed for as little preload as is necessary to take play out of the system. Any more preload than this harms ride performance. SPRINDEX IS PROGRESSIVE Besides having an adjustable spring rate, Sprindex is also progressive. Sprindex is specifically designed to have a progressive spring rate for the last 20% of stroke for big hit support and for bikes with a linear linkage design. Coil versus Air: A coil is usually very linear, whereas an air shock starts out Regressive (a reducing spring rate), and then turns progressive (an increasing spring rate). See the chart below. One of the disadvantages to using an Air shock is that its regressiveness mean less small bump sensitivity and traction. This is partly why Air shocks are not as plush as Coil. Regardless of your bike's suspension design, Sprindex being linear between about 0-80% stroke and progressive between about 80% and 100% stroke works great because it provides unbeatable sensitivity and traction through all the small and medium movement and it provides progressive support for big hits. Most importantly, Sprindex also provides spring rate adjustment in order to fine tune the perfect spring rate so that you maximize your suspension performance. Performance Adapters Performance Adapters are included. Sprindex coils fit a wide variety of shocks, but you must use the Performance Adapters for most of them. Our Performance Adapters both improve the fit between the coil and your shock and are made of low friction Delrin to improve shock performance by allowing the spring to twist during high deflection. Also, the Performance Adapters help prevent the preload ring from self-adjusting due to coil windup. See bottom of Performance Adapter for instruction of which Performance Adapter you should use. For Rockshox, no Performance Adapter is required but we recommend you use the Performance Washer adapter for shock performance and to help prevent preload self-adjustment.\u003c\/p\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748551233584,"sku":"SD24400-RP","price":239.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/Shock_Spring_Sprindex_Light_Trail_Model_Range_380-430_lbs.jpg?v=1791294411"},{"product_id":"sprindex-shock-spring-sprindex-light-trail-430-500lbs-1","title":"Shock Spring Sprindex Light Trail 430-500lbs","description":"\u003cp\u003eSPRINDEX ALLOWS FOR TOOL-FREE, EASY ADJUSTMENT OF YOUR COIL'S SPRING RATE. Adjusting your shock's spring rate can profoundly improve your bike's handling and suspension. In fact, you may find yourself using different spring rates for different trails, depending on the conditions and type of trail. Or you may increase your spring rate for long climbs and decrease it for down hills. No expense was spared on the materials or manufacturing processed used. The coil itself is made of super high tensile spring steel similar to \"lightweight\" springs (which is why Sprindex is lighter than regular springs) in order to handle the stress of the system when adjusted to its highest spring rate setting, as well as reduce coil mass. The Sprindex assembly is made of glass reinforced polymer. The 5 included adapters are made of slippery Delrin. Spring rate is the force required to move a spring a given distance and independent of preload. For example, a \"400 lb\/in\" spring requires 400 pounds to move the spring 1 inch and 800 pounds to move a spring 2 inches. Preload is how much force is required to start moving the spring. Sprindex is patent pending in many countries. Follow your shock manufacturer's instructions for preload amount and sag and other shock adjustments. Do not preload your Sprindex more than 3 turns and 1 to 2 turns is preferred. Your Sprindex coil behaves like a regular coil that has a spring rate the same as your adjusted Sprindex spring rate. Adjusting your Sprindex does not change the length of the coil and so does not change your preload. Preload is adjusted normally and with the threaded ring that came with your shock. HOW DOES SPRINDEX ADJUST SPRING RATE? The spring rate of a spring is the amount of force it takes to deflect the spring a certain distance (typically pounds per inch or Newtons per mm). Spring rate is a function of 4 characteristics: wire diameter, coil diameter, material, and number of active coils. More active coils causes a lower spring rate and fewer active coils causes a higher spring rate. Think of it like this: the less wire there is to bend, the stiffer the spring. By twisting the Dial, Sprindex works by altering the number of active coils available for deflection. The adjusted spring rate is displayed through a window in the Dial. COIL SHOCKS VERSUS AIR SHOCKS Most agree that coil shocks outperform air shocks, assuming the right spring rate for the particular rider. Air shocks have significant \"stiction\" which is friction that resists the shock's initial movement. Coil shocks have much less stiction. Coil shocks soak up small bumps much better, better tire contact with the ground, give better traction, better ride quality, and make a rider measurably faster. So why are air shocks more common? The answer is lack of adjustability for coils and weight. Traditional coils have a fixed spring rate and spring rate has a dramatic effect on riding performance and feel. Most people ride the wrong spring rate because springs are typically only available in wide increments. Spring rate has a profound effect on bike performance. Coil shocks also weigh more than air shocks, but when using the right spring rate, the small weight penalty is easily worth it. Besides, Sprindex is lighter than ordinary shock springs. SPRING RATE IS DIFFERENT FROM PRELOAD Coil shocks include a threaded ring for preloading the coil. However, preloading is not the same as using a stiffer (higher spring rate) spring. Sprindex Preload A sprindex coil behaves exactly like a regular coil of the selected spring rate. For example, Sprindex adjusted to 435 lb\/in behaves just like a custom made 435 lb\/in standard coil. Poor small bump absorption resulting in a harsh ride and poor traction because it increases force to start coil movement. Either reduces shock travel and\/or over-stresses spring. Improper SAG. SAG must be achieved by spring rate, not preload. Doesn't change coil spring rate. If you bottom out with a spring, heavy preloading may not solve this and will mess up the rest of the stroke. Mountain bike shocks are designed for as little preload as is necessary to take play out of the system. Any more preload than this harms ride performance. SPRINDEX IS PROGRESSIVE Besides having an adjustable spring rate, Sprindex is also progressive. Sprindex is specifically designed to have a progressive spring rate for the last 20% of stroke for big hit support and for bikes with a linear linkage design. Coil versus Air: A coil is usually very linear, whereas an air shock starts out Regressive (a reducing spring rate), and then turns progressive (an increasing spring rate). See the chart below. One of the disadvantages to using an Air shock is that its regressiveness mean less small bump sensitivity and traction. This is partly why Air shocks are not as plush as Coil. Regardless of your bike's suspension design, Sprindex being linear between about 0-80% stroke and progressive between about 80% and 100% stroke works great because it provides unbeatable sensitivity and traction through all the small and medium movement and it provides progressive support for big hits. Most importantly, Sprindex also provides spring rate adjustment in order to fine tune the perfect spring rate so that you maximize your suspension performance. Performance Adapters Performance Adapters are included. Sprindex coils fit a wide variety of shocks, but you must use the Performance Adapters for most of them. Our Performance Adapters both improve the fit between the coil and your shock and are made of low friction Delrin to improve shock performance by allowing the spring to twist during high deflection. Also, the Performance Adapters help prevent the preload ring from self-adjusting due to coil windup. See bottom of Performance Adapter for instruction of which Performance Adapter you should use. For Rockshox, no Performance Adapter is required but we recommend you use the Performance Washer adapter for shock performance and to help prevent preload self-adjustment.\u003c\/p\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748551299120,"sku":"SD24450-RP","price":239.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/Shock_Spring_Sprindex_Light_Trail_Model_Range_430-500_lbs_Stroke_55_mm.jpg?v=1791294412"},{"product_id":"sprindex-shock-spring-sprindex-light-trail-450-540-lbs","title":"Shock Spring Sprindex Light Trail 450-540 lbs","description":"\u003cp\u003e\u003cstrong\u003eSprindex Light Trail Adjustable Coil Shock Shock Spring (450–540 lbs \/ 55mm Stroke)\u003c\/strong\u003e\u003c\/p\u003e\r\n\u003cp\u003eWe make things that work better and last longer. Our products solve real problems with clean design and honest materials. The Sprindex Light Trail combines the unmatched small-bump sensitivity, traction, and ride quality of a high-performance coil shock with revolutionary, tool-free spring rate adjustability.\u003c\/p\u003e\r\n\u003cp\u003eTraditional coil springs lock you into a single fixed rate, forcing you to compromise between climbing efficiency and descending support. Sprindex solves this by altering the number of active coils via an easy-to-twist dial. Adjust your spring rate higher for long, grinding climbs, and dial it back down for plush, high-speed descents—all without changing your preload or swapping springs.\u003c\/p\u003e\r\n\u003ch3\u003eKey Features\u003c\/h3\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eTool-Free Spring Rate Adjustability:\u003c\/strong\u003e Easily twist the dial to fine-tune your spring rate anywhere between 450 lbs and 540 lbs to match the trail, conditions, or your riding style.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eProgressive Finish:\u003c\/strong\u003e Engineered with a progressive spring rate over the final 20% of the stroke to provide exceptional big-hit support and pair seamlessly with linear suspension linkages.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eUltra-Lightweight High-Tensile Steel:\u003c\/strong\u003e Utilizes premium, highest-grade spring steel to reduce coil mass while safely handling extreme stress at maximum settings.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eLow-Friction Delrin Performance Adapters:\u003c\/strong\u003e Includes 5 specialized performance adapters that optimize fit across a wide variety of shock bodies while allowing the spring to twist smoothly during high deflection, preventing preload self-adjustment.\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eBrand \/ Model:\u003c\/strong\u003e Sprindex Light Trail\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eSpring Rate Range:\u003c\/strong\u003e 450 lbs – 540 lbs \/ in\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eStroke:\u003c\/strong\u003e 55 mm \/ 2.2 inches\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eSpring Length:\u003c\/strong\u003e 126 mm\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 437g\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eMaterials:\u003c\/strong\u003e Super High-Tensile Spring Steel (Coil), Glass-Reinforced Polymer (Assembly Dial), Delrin (Performance Adapters)\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eItem Fit \u0026amp; Compatibility Tools:\u003c\/strong\u003e \u003ca href=\"https:\/\/sprindex.com\/pages\/sprindex-finder\" target=\"_blank\" rel=\"noopener\"\u003eSprindex Finder Fit Tool\u003c\/a\u003e | \u003ca href=\"https:\/\/sprindex.com\/pages\/compatibility\" target=\"_blank\" rel=\"noopener\"\u003eCompatibility Guide\u003c\/a\u003e\n\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\u003ch3\u003ePackage List\u003c\/h3\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e1 x Sprindex Light Trail Adjustable Coil Spring (450-540 lbs)\u003c\/li\u003e\r\n\u003cli\u003e1 x Integrated Adjustment Dial\u003c\/li\u003e\r\n\u003cli\u003e5 x Performance Adapters (Delrin)\u003c\/li\u003e\r\n\u003cli\u003e1 x User Manual \/ Setup Guide\u003c\/li\u003e\r\n\u003c\/ul\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748551397424,"sku":"SD24500-RP","price":269.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/55mm_Sprindex_Black.png?v=1791294413"},{"product_id":"sprindex-shock-spring-sprindex-light-trail-550-610-lbs-1","title":"Shock Spring Sprindex Light Trail 550-610 lbs","description":"\u003cp\u003eSPRINDEX ALLOWS FOR TOOL-FREE, EASY ADJUSTMENT OF YOUR COIL'S SPRING RATE. Adjusting your shock's spring rate can profoundly improve your bike's handling and suspension. In fact, you may find yourself using different spring rates for different trails, depending on the conditions and type of trail. Or you may increase your spring rate for long climbs and decrease it for down hills. No expense was spared on the materials or manufacturing processed used. The coil itself is made of super high tensile spring steel similar to \"lightweight\" springs (which is why Sprindex is lighter than regular springs) in order to handle the stress of the system when adjusted to its highest spring rate setting, as well as reduce coil mass. The Sprindex assembly is made of glass reinforced polymer. The 5 included adapters are made of slippery Delrin. Spring rate is the force required to move a spring a given distance and independent of preload. For example, a \"400 lb\/in\" spring requires 400 pounds to move the spring 1 inch and 800 pounds to move a spring 2 inches. Preload is how much force is required to start moving the spring. Sprindex is patent pending in many countries. Follow your shock manufacturer's instructions for preload amount and sag and other shock adjustments. Do not preload your Sprindex more than 3 turns and 1 to 2 turns is preferred. Your Sprindex coil behaves like a regular coil that has a spring rate the same as your adjusted Sprindex spring rate. Adjusting your Sprindex does not change the length of the coil and so does not change your preload. Preload is adjusted normally and with the threaded ring that came with your shock. HOW DOES SPRINDEX ADJUST SPRING RATE? The spring rate of a spring is the amount of force it takes to deflect the spring a certain distance (typically pounds per inch or Newtons per mm). Spring rate is a function of 4 characteristics: wire diameter, coil diameter, material, and number of active coils. More active coils causes a lower spring rate and fewer active coils causes a higher spring rate. Think of it like this: the less wire there is to bend, the stiffer the spring. By twisting the Dial, Sprindex works by altering the number of active coils available for deflection. The adjusted spring rate is displayed through a window in the Dial. COIL SHOCKS VERSUS AIR SHOCKS Most agree that coil shocks outperform air shocks, assuming the right spring rate for the particular rider. Air shocks have significant \"stiction\" which is friction that resists the shock's initial movement. Coil shocks have much less stiction. Coil shocks soak up small bumps much better, better tire contact with the ground, give better traction, better ride quality, and make a rider measurably faster. So why are air shocks more common? The answer is lack of adjustability for coils and weight. Traditional coils have a fixed spring rate and spring rate has a dramatic effect on riding performance and feel. Most people ride the wrong spring rate because springs are typically only available in wide increments. Spring rate has a profound effect on bike performance. Coil shocks also weigh more than air shocks, but when using the right spring rate, the small weight penalty is easily worth it. Besides, Sprindex is lighter than ordinary shock springs. SPRING RATE IS DIFFERENT FROM PRELOAD Coil shocks include a threaded ring for preloading the coil. However, preloading is not the same as using a stiffer (higher spring rate) spring. Sprindex Preload A sprindex coil behaves exactly like a regular coil of the selected spring rate. For example, Sprindex adjusted to 435 lb\/in behaves just like a custom made 435 lb\/in standard coil. Poor small bump absorption resulting in a harsh ride and poor traction because it increases force to start coil movement. Either reduces shock travel and\/or over-stresses spring. Improper SAG. SAG must be achieved by spring rate, not preload. Doesn't change coil spring rate. If you bottom out with a spring, heavy preloading may not solve this and will mess up the rest of the stroke. Mountain bike shocks are designed for as little preload as is necessary to take play out of the system. Any more preload than this harms ride performance. SPRINDEX IS PROGRESSIVE Besides having an adjustable spring rate, Sprindex is also progressive. Sprindex is specifically designed to have a progressive spring rate for the last 20% of stroke for big hit support and for bikes with a linear linkage design. Coil versus Air: A coil is usually very linear, whereas an air shock starts out Regressive (a reducing spring rate), and then turns progressive (an increasing spring rate). See the chart below. One of the disadvantages to using an Air shock is that its regressiveness mean less small bump sensitivity and traction. This is partly why Air shocks are not as plush as Coil. Regardless of your bike's suspension design, Sprindex being linear between about 0-80% stroke and progressive between about 80% and 100% stroke works great because it provides unbeatable sensitivity and traction through all the small and medium movement and it provides progressive support for big hits. Most importantly, Sprindex also provides spring rate adjustment in order to fine tune the perfect spring rate so that you maximize your suspension performance. Performance Adapters Performance Adapters are included. Sprindex coils fit a wide variety of shocks, but you must use the Performance Adapters for most of them. Our Performance Adapters both improve the fit between the coil and your shock and are made of low friction Delrin to improve shock performance by allowing the spring to twist during high deflection. Also, the Performance Adapters help prevent the preload ring from self-adjusting due to coil windup. See bottom of Performance Adapter for instruction of which Performance Adapter you should use. For Rockshox, no Performance Adapter is required but we recommend you use the Performance Washer adapter for shock performance and to help prevent preload self-adjustment.\u003c\/p\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748551462960,"sku":"SD24550-RP","price":269.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/Shock_Spring_Sprindex_Light_Trail_Model_Range_550-610_lbs.jpg?v=1791294413"},{"product_id":"sprindex-shock-spring-sprindex-light-trail-610-690-lbs-1","title":"Shock Spring Sprindex Light Trail 610-690 lbs","description":"\u003cp\u003eSPRINDEX ALLOWS FOR TOOL-FREE, EASY ADJUSTMENT OF YOUR COIL'S SPRING RATE. Adjusting your shock's spring rate can profoundly improve your bike's handling and suspension. In fact, you may find yourself using different spring rates for different trails, depending on the conditions and type of trail. Or you may increase your spring rate for long climbs and decrease it for down hills. No expense was spared on the materials or manufacturing processed used. The coil itself is made of super high tensile spring steel similar to \"lightweight\" springs (which is why Sprindex is lighter than regular springs) in order to handle the stress of the system when adjusted to its highest spring rate setting, as well as reduce coil mass. The Sprindex assembly is made of glass reinforced polymer. The 5 included adapters are made of slippery Delrin. Spring rate is the force required to move a spring a given distance and independent of preload. For example, a \"400 lb\/in\" spring requires 400 pounds to move the spring 1 inch and 800 pounds to move a spring 2 inches. Preload is how much force is required to start moving the spring. Sprindex is patent pending in many countries. Follow your shock manufacturer's instructions for preload amount and sag and other shock adjustments. Do not preload your Sprindex more than 3 turns and 1 to 2 turns is preferred. Your Sprindex coil behaves like a regular coil that has a spring rate the same as your adjusted Sprindex spring rate. Adjusting your Sprindex does not change the length of the coil and so does not change your preload. Preload is adjusted normally and with the threaded ring that came with your shock. HOW DOES SPRINDEX ADJUST SPRING RATE? The spring rate of a spring is the amount of force it takes to deflect the spring a certain distance (typically pounds per inch or Newtons per mm). Spring rate is a function of 4 characteristics: wire diameter, coil diameter, material, and number of active coils. More active coils causes a lower spring rate and fewer active coils causes a higher spring rate. Think of it like this: the less wire there is to bend, the stiffer the spring. By twisting the Dial, Sprindex works by altering the number of active coils available for deflection. The adjusted spring rate is displayed through a window in the Dial. COIL SHOCKS VERSUS AIR SHOCKS Most agree that coil shocks outperform air shocks, assuming the right spring rate for the particular rider. Air shocks have significant \"stiction\" which is friction that resists the shock's initial movement. Coil shocks have much less stiction. Coil shocks soak up small bumps much better, better tire contact with the ground, give better traction, better ride quality, and make a rider measurably faster. So why are air shocks more common? The answer is lack of adjustability for coils and weight. Traditional coils have a fixed spring rate and spring rate has a dramatic effect on riding performance and feel. Most people ride the wrong spring rate because springs are typically only available in wide increments. Spring rate has a profound effect on bike performance. Coil shocks also weigh more than air shocks, but when using the right spring rate, the small weight penalty is easily worth it. Besides, Sprindex is lighter than ordinary shock springs. SPRING RATE IS DIFFERENT FROM PRELOAD Coil shocks include a threaded ring for preloading the coil. However, preloading is not the same as using a stiffer (higher spring rate) spring. Sprindex Preload A sprindex coil behaves exactly like a regular coil of the selected spring rate. For example, Sprindex adjusted to 435 lb\/in behaves just like a custom made 435 lb\/in standard coil. Poor small bump absorption resulting in a harsh ride and poor traction because it increases force to start coil movement. Either reduces shock travel and\/or over-stresses spring. Improper SAG. SAG must be achieved by spring rate, not preload. Doesn't change coil spring rate. If you bottom out with a spring, heavy preloading may not solve this and will mess up the rest of the stroke. Mountain bike shocks are designed for as little preload as is necessary to take play out of the system. Any more preload than this harms ride performance. SPRINDEX IS PROGRESSIVE Besides having an adjustable spring rate, Sprindex is also progressive. Sprindex is specifically designed to have a progressive spring rate for the last 20% of stroke for big hit support and for bikes with a linear linkage design. Coil versus Air: A coil is usually very linear, whereas an air shock starts out Regressive (a reducing spring rate), and then turns progressive (an increasing spring rate). See the chart below. One of the disadvantages to using an Air shock is that its regressiveness mean less small bump sensitivity and traction. This is partly why Air shocks are not as plush as Coil. Regardless of your bike's suspension design, Sprindex being linear between about 0-80% stroke and progressive between about 80% and 100% stroke works great because it provides unbeatable sensitivity and traction through all the small and medium movement and it provides progressive support for big hits. Most importantly, Sprindex also provides spring rate adjustment in order to fine tune the perfect spring rate so that you maximize your suspension performance. Performance Adapters Performance Adapters are included. Sprindex coils fit a wide variety of shocks, but you must use the Performance Adapters for most of them. Our Performance Adapters both improve the fit between the coil and your shock and are made of low friction Delrin to improve shock performance by allowing the spring to twist during high deflection. Also, the Performance Adapters help prevent the preload ring from self-adjusting due to coil windup. See bottom of Performance Adapter for instruction of which Performance Adapter you should use. For Rockshox, no Performance Adapter is required but we recommend you use the Performance Washer adapter for shock performance and to help prevent preload self-adjustment.\u003c\/p\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748551528496,"sku":"SD24620-RP","price":269.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/Shock_Spring_Sprindex_Light_Trail_Model__Range_610-690_lbs.jpg?v=1791294413"},{"product_id":"sprindex-shock-spring-sprindex-trail-enduro-340-380-lbs-1","title":"Shock Spring Sprindex Trail \/ Enduro 340-380 lbs","description":"\u003cp\u003eSPRINDEX ALLOWS FOR TOOL-FREE, EASY ADJUSTMENT OF YOUR COIL'S SPRING RATE. Adjusting your shock's spring rate can profoundly improve your bike's handling and suspension. In fact, you may find yourself using different spring rates for different trails, depending on the conditions and type of trail. Or you may increase your spring rate for long climbs and decrease it for down hills. No expense was spared on the materials or manufacturing processed used. The coil itself is made of super high tensile spring steel similar to \"lightweight\" springs (which is why Sprindex is lighter than regular springs) in order to handle the stress of the system when adjusted to its highest spring rate setting, as well as reduce coil mass. The Sprindex assembly is made of glass reinforced polymer. The 5 included adapters are made of slippery Delrin. Spring rate is the force required to move a spring a given distance and independent of preload. For example, a \"400 lb\/in\" spring requires 400 pounds to move the spring 1 inch and 800 pounds to move a spring 2 inches. Preload is how much force is required to start moving the spring. Sprindex is patent pending in many countries. Follow your shock manufacturer's instructions for preload amount and sag and other shock adjustments. Do not preload your Sprindex more than 3 turns and 1 to 2 turns is preferred. Your Sprindex coil behaves like a regular coil that has a spring rate the same as your adjusted Sprindex spring rate. Adjusting your Sprindex does not change the length of the coil and so does not change your preload. Preload is adjusted normally and with the threaded ring that came with your shock. HOW DOES SPRINDEX ADJUST SPRING RATE? The spring rate of a spring is the amount of force it takes to deflect the spring a certain distance (typically pounds per inch or Newtons per mm). Spring rate is a function of 4 characteristics: wire diameter, coil diameter, material, and number of active coils. More active coils causes a lower spring rate and fewer active coils causes a higher spring rate. Think of it like this: the less wire there is to bend, the stiffer the spring. By twisting the Dial, Sprindex works by altering the number of active coils available for deflection. The adjusted spring rate is displayed through a window in the Dial. COIL SHOCKS VERSUS AIR SHOCKS Most agree that coil shocks outperform air shocks, assuming the right spring rate for the particular rider. Air shocks have significant \"stiction\" which is friction that resists the shock's initial movement. Coil shocks have much less stiction. Coil shocks soak up small bumps much better, better tire contact with the ground, give better traction, better ride quality, and make a rider measurably faster. So why are air shocks more common? The answer is lack of adjustability for coils and weight. Traditional coils have a fixed spring rate and spring rate has a dramatic effect on riding performance and feel. Most people ride the wrong spring rate because springs are typically only available in wide increments. Spring rate has a profound effect on bike performance. Coil shocks also weigh more than air shocks, but when using the right spring rate, the small weight penalty is easily worth it. Besides, Sprindex is lighter than ordinary shock springs. SPRING RATE IS DIFFERENT FROM PRELOAD Coil shocks include a threaded ring for preloading the coil. However, preloading is not the same as using a stiffer (higher spring rate) spring. Sprindex Preload A sprindex coil behaves exactly like a regular coil of the selected spring rate. For example, Sprindex adjusted to 435 lb\/in behaves just like a custom made 435 lb\/in standard coil. Poor small bump absorption resulting in a harsh ride and poor traction because it increases force to start coil movement. Either reduces shock travel and\/or over-stresses spring. Improper SAG. SAG must be achieved by spring rate, not preload. Doesn't change coil spring rate. If you bottom out with a spring, heavy preloading may not solve this and will mess up the rest of the stroke. Mountain bike shocks are designed for as little preload as is necessary to take play out of the system. Any more preload than this harms ride performance. SPRINDEX IS PROGRESSIVE Besides having an adjustable spring rate, Sprindex is also progressive. Sprindex is specifically designed to have a progressive spring rate for the last 20% of stroke for big hit support and for bikes with a linear linkage design. Coil versus Air: A coil is usually very linear, whereas an air shock starts out Regressive (a reducing spring rate), and then turns progressive (an increasing spring rate). See the chart below. One of the disadvantages to using an Air shock is that its regressiveness mean less small bump sensitivity and traction. This is partly why Air shocks are not as plush as Coil. Regardless of your bike's suspension design, Sprindex being linear between about 0-80% stroke and progressive between about 80% and 100% stroke works great because it provides unbeatable sensitivity and traction through all the small and medium movement and it provides progressive support for big hits. Most importantly, Sprindex also provides spring rate adjustment in order to fine tune the perfect spring rate so that you maximize your suspension performance. Performance Adapters Performance Adapters are included. Sprindex coils fit a wide variety of shocks, but you must use the Performance Adapters for most of them. Our Performance Adapters both improve the fit between the coil and your shock and are made of low friction Delrin to improve shock performance by allowing the spring to twist during high deflection. Also, the Performance Adapters help prevent the preload ring from self-adjusting due to coil windup. See bottom of Performance Adapter for instruction of which Performance Adapter you should use. For Rockshox, no Performance Adapter is required but we recommend you use the Performance Washer adapter for shock performance and to help prevent preload self-adjustment.\u003c\/p\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748551659568,"sku":"SD40350-RP","price":269.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/Shock_Spring_Sprindex_Trail_Enduro_Model_Range_340-380_lbs.jpg?v=1791294414"},{"product_id":"sprindex-shock-spring-sprindex-trail-enduro-390-430lbs-1","title":"Shock Spring Sprindex Trail \/ Enduro 390-430lbs","description":"\u003cp\u003eSPRINDEX ALLOWS FOR TOOL-FREE, EASY ADJUSTMENT OF YOUR COIL'S SPRING RATE. Adjusting your shock's spring rate can profoundly improve your bike's handling and suspension. In fact, you may find yourself using different spring rates for different trails, depending on the conditions and type of trail. Or you may increase your spring rate for long climbs and decrease it for down hills. No expense was spared on the materials or manufacturing processed used. The coil itself is made of super high tensile spring steel similar to \"lightweight\" springs (which is why Sprindex is lighter than regular springs) in order to handle the stress of the system when adjusted to its highest spring rate setting, as well as reduce coil mass. The Sprindex assembly is made of glass reinforced polymer. The 5 included adapters are made of slippery Delrin. Spring rate is the force required to move a spring a given distance and independent of preload. For example, a \"400 lb\/in\" spring requires 400 pounds to move the spring 1 inch and 800 pounds to move a spring 2 inches. Preload is how much force is required to start moving the spring. Sprindex is patent pending in many countries. Follow your shock manufacturer's instructions for preload amount and sag and other shock adjustments. Do not preload your Sprindex more than 3 turns and 1 to 2 turns is preferred. Your Sprindex coil behaves like a regular coil that has a spring rate the same as your adjusted Sprindex spring rate. Adjusting your Sprindex does not change the length of the coil and so does not change your preload. Preload is adjusted normally and with the threaded ring that came with your shock. HOW DOES SPRINDEX ADJUST SPRING RATE? The spring rate of a spring is the amount of force it takes to deflect the spring a certain distance (typically pounds per inch or Newtons per mm). Spring rate is a function of 4 characteristics: wire diameter, coil diameter, material, and number of active coils. More active coils causes a lower spring rate and fewer active coils causes a higher spring rate. Think of it like this: the less wire there is to bend, the stiffer the spring. By twisting the Dial, Sprindex works by altering the number of active coils available for deflection. The adjusted spring rate is displayed through a window in the Dial. COIL SHOCKS VERSUS AIR SHOCKS Most agree that coil shocks outperform air shocks, assuming the right spring rate for the particular rider. Air shocks have significant \"stiction\" which is friction that resists the shock's initial movement. Coil shocks have much less stiction. Coil shocks soak up small bumps much better, better tire contact with the ground, give better traction, better ride quality, and make a rider measurably faster. So why are air shocks more common? The answer is lack of adjustability for coils and weight. Traditional coils have a fixed spring rate and spring rate has a dramatic effect on riding performance and feel. Most people ride the wrong spring rate because springs are typically only available in wide increments. Spring rate has a profound effect on bike performance. Coil shocks also weigh more than air shocks, but when using the right spring rate, the small weight penalty is easily worth it. Besides, Sprindex is lighter than ordinary shock springs. SPRING RATE IS DIFFERENT FROM PRELOAD Coil shocks include a threaded ring for preloading the coil. However, preloading is not the same as using a stiffer (higher spring rate) spring. Sprindex Preload A sprindex coil behaves exactly like a regular coil of the selected spring rate. For example, Sprindex adjusted to 435 lb\/in behaves just like a custom made 435 lb\/in standard coil. Poor small bump absorption resulting in a harsh ride and poor traction because it increases force to start coil movement. Either reduces shock travel and\/or over-stresses spring. Improper SAG. SAG must be achieved by spring rate, not preload. Doesn't change coil spring rate. If you bottom out with a spring, heavy preloading may not solve this and will mess up the rest of the stroke. Mountain bike shocks are designed for as little preload as is necessary to take play out of the system. Any more preload than this harms ride performance. SPRINDEX IS PROGRESSIVE Besides having an adjustable spring rate, Sprindex is also progressive. Sprindex is specifically designed to have a progressive spring rate for the last 20% of stroke for big hit support and for bikes with a linear linkage design. Coil versus Air: A coil is usually very linear, whereas an air shock starts out Regressive (a reducing spring rate), and then turns progressive (an increasing spring rate). See the chart below. One of the disadvantages to using an Air shock is that its regressiveness mean less small bump sensitivity and traction. This is partly why Air shocks are not as plush as Coil. Regardless of your bike's suspension design, Sprindex being linear between about 0-80% stroke and progressive between about 80% and 100% stroke works great because it provides unbeatable sensitivity and traction through all the small and medium movement and it provides progressive support for big hits. Most importantly, Sprindex also provides spring rate adjustment in order to fine tune the perfect spring rate so that you maximize your suspension performance. Performance Adapters Performance Adapters are included. Sprindex coils fit a wide variety of shocks, but you must use the Performance Adapters for most of them. Our Performance Adapters both improve the fit between the coil and your shock and are made of low friction Delrin to improve shock performance by allowing the spring to twist during high deflection. Also, the Performance Adapters help prevent the preload ring from self-adjusting due to coil windup. See bottom of Performance Adapter for instruction of which Performance Adapter you should use. For Rockshox, no Performance Adapter is required but we recommend you use the Performance Washer adapter for shock performance and to help prevent preload self-adjustment.\u003c\/p\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748551725104,"sku":"SD40400-RP","price":269.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/Shock_Spring_Sprindex_Trail_Enduro_Model__Range_390-430_lbs.jpg?v=1791294415"},{"product_id":"sprindex-shock-spring-sprindex-trail-enduro-450-500lbs-1","title":"Shock Spring Sprindex Trail \/ Enduro 450-500lbs","description":"\u003cp\u003eSPRINDEX ALLOWS FOR TOOL-FREE, EASY ADJUSTMENT OF YOUR COIL'S SPRING RATE. Adjusting your shock's spring rate can profoundly improve your bike's handling and suspension. In fact, you may find yourself using different spring rates for different trails, depending on the conditions and type of trail. Or you may increase your spring rate for long climbs and decrease it for down hills. No expense was spared on the materials or manufacturing processed used. The coil itself is made of super high tensile spring steel similar to \"lightweight\" springs (which is why Sprindex is lighter than regular springs) in order to handle the stress of the system when adjusted to its highest spring rate setting, as well as reduce coil mass. The Sprindex assembly is made of glass reinforced polymer. The 5 included adapters are made of slippery Delrin. Spring rate is the force required to move a spring a given distance and independent of preload. For example, a \"400 lb\/in\" spring requires 400 pounds to move the spring 1 inch and 800 pounds to move a spring 2 inches. Preload is how much force is required to start moving the spring. Sprindex is patent pending in many countries. Follow your shock manufacturer's instructions for preload amount and sag and other shock adjustments. Do not preload your Sprindex more than 3 turns and 1 to 2 turns is preferred. Your Sprindex coil behaves like a regular coil that has a spring rate the same as your adjusted Sprindex spring rate. Adjusting your Sprindex does not change the length of the coil and so does not change your preload. Preload is adjusted normally and with the threaded ring that came with your shock. HOW DOES SPRINDEX ADJUST SPRING RATE? The spring rate of a spring is the amount of force it takes to deflect the spring a certain distance (typically pounds per inch or Newtons per mm). Spring rate is a function of 4 characteristics: wire diameter, coil diameter, material, and number of active coils. More active coils causes a lower spring rate and fewer active coils causes a higher spring rate. Think of it like this: the less wire there is to bend, the stiffer the spring. By twisting the Dial, Sprindex works by altering the number of active coils available for deflection. The adjusted spring rate is displayed through a window in the Dial. COIL SHOCKS VERSUS AIR SHOCKS Most agree that coil shocks outperform air shocks, assuming the right spring rate for the particular rider. Air shocks have significant \"stiction\" which is friction that resists the shock's initial movement. Coil shocks have much less stiction. Coil shocks soak up small bumps much better, better tire contact with the ground, give better traction, better ride quality, and make a rider measurably faster. So why are air shocks more common? The answer is lack of adjustability for coils and weight. Traditional coils have a fixed spring rate and spring rate has a dramatic effect on riding performance and feel. Most people ride the wrong spring rate because springs are typically only available in wide increments. Spring rate has a profound effect on bike performance. Coil shocks also weigh more than air shocks, but when using the right spring rate, the small weight penalty is easily worth it. Besides, Sprindex is lighter than ordinary shock springs. SPRING RATE IS DIFFERENT FROM PRELOAD Coil shocks include a threaded ring for preloading the coil. However, preloading is not the same as using a stiffer (higher spring rate) spring. Sprindex Preload A sprindex coil behaves exactly like a regular coil of the selected spring rate. For example, Sprindex adjusted to 435 lb\/in behaves just like a custom made 435 lb\/in standard coil. Poor small bump absorption resulting in a harsh ride and poor traction because it increases force to start coil movement. Either reduces shock travel and\/or over-stresses spring. Improper SAG. SAG must be achieved by spring rate, not preload. Doesn't change coil spring rate. If you bottom out with a spring, heavy preloading may not solve this and will mess up the rest of the stroke. Mountain bike shocks are designed for as little preload as is necessary to take play out of the system. Any more preload than this harms ride performance. SPRINDEX IS PROGRESSIVE Besides having an adjustable spring rate, Sprindex is also progressive. Sprindex is specifically designed to have a progressive spring rate for the last 20% of stroke for big hit support and for bikes with a linear linkage design. Coil versus Air: A coil is usually very linear, whereas an air shock starts out Regressive (a reducing spring rate), and then turns progressive (an increasing spring rate). See the chart below. One of the disadvantages to using an Air shock is that its regressiveness mean less small bump sensitivity and traction. This is partly why Air shocks are not as plush as Coil. Regardless of your bike's suspension design, Sprindex being linear between about 0-80% stroke and progressive between about 80% and 100% stroke works great because it provides unbeatable sensitivity and traction through all the small and medium movement and it provides progressive support for big hits. Most importantly, Sprindex also provides spring rate adjustment in order to fine tune the perfect spring rate so that you maximize your suspension performance. Performance Adapters Performance Adapters are included. Sprindex coils fit a wide variety of shocks, but you must use the Performance Adapters for most of them. Our Performance Adapters both improve the fit between the coil and your shock and are made of low friction Delrin to improve shock performance by allowing the spring to twist during high deflection. Also, the Performance Adapters help prevent the preload ring from self-adjusting due to coil windup. See bottom of Performance Adapter for instruction of which Performance Adapter you should use. For Rockshox, no Performance Adapter is required but we recommend you use the Performance Washer adapter for shock performance and to help prevent preload self-adjustment.\u003c\/p\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748551856176,"sku":"SD40450-RP","price":269.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/Shock_Spring_Sprindex_Trail_Enduro_Model_Range_450-500_lbs.jpg?v=1791294416"},{"product_id":"sprindex-shock-spring-sprindex-trail-enduro-490-560-lbs","title":"Shock Spring Sprindex Trail \/ Enduro 490-560 lbs","description":"\u003cp\u003e\u003cstrong\u003eSprindex Adjustable Trail \/ Enduro Coil Shock Spring - 490-560 lbs (65mm Stroke)\u003c\/strong\u003e\u003c\/p\u003e\r\n\u003cp\u003e\u003cstrong\u003eSprindex allows for tool-free, easy adjustment of your coil's spring rate.\u003c\/strong\u003e Adjusting your shock's spring rate can profoundly improve your bike's handling and suspension performance. Depending on trail conditions, you can increase your spring rate for long, efficient climbs and decrease it for plush, controlled descents—or fine-tune your setup for different trails entirely.\u003c\/p\u003e\r\n\u003cp\u003eNo expense was spared on materials or manufacturing. The coil itself is made of super high tensile spring steel—similar to lightweight racing springs to reduce mass and withstand the extreme stresses of higher adjustment settings. The adjustment assembly is built from glass-reinforced polymer, and the included adapters are molded from slippery, low-friction Delrin.\u003c\/p\u003e\r\n\u003ch3\u003eWhy Sprindex?\u003c\/h3\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eTool-Free Adjustability:\u003c\/strong\u003e Twist the dial to change the number of active coils, altering your spring rate on the fly. The currently selected rate is displayed clearly through a window in the dial.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eProgressive Support:\u003c\/strong\u003e Engineered with a linear feel from 0-80% stroke for unmatched small-bump sensitivity and traction, transitioning to a progressive rate for the final 20% of stroke to provide big-hit bottom-out support.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eWeight \u0026amp; Performance:\u003c\/strong\u003e Lighter than ordinary fixed-rate coils, giving you the plush, stiction-free performance of a coil shock with the tuning flexibility you need.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eLow-Friction Adapters:\u003c\/strong\u003e Includes 5 Delrin performance adapters that improve shock fitment, eliminate binding, allow the spring to twist naturally during deflection, and prevent the preload ring from self-adjusting due to coil windup. *(Note: RockShox shocks do not require an adapter, though the performance washer is recommended).*\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sprindex\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Adjustable Coil Shock Spring\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eModel Range:\u003c\/strong\u003e Trail \/ Enduro (490 - 560 lbs)\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eStroke:\u003c\/strong\u003e 65 mm\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eLength (Without Adapters):\u003c\/strong\u003e 140 mm\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 464 grams\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eMaterials:\u003c\/strong\u003e Super High Tensile Spring Steel (Coil) \/ Glass-Reinforced Polymer (Assembly) \/ Delrin (Adapters)\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eIncluded Extras:\u003c\/strong\u003e 5x Performance Adapters for broad shock brand compatibility\u003c\/li\u003e\r\n\u003c\/ul\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748551888944,"sku":"SD40500-RP","price":269.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/Shock_Spring_Sprindex_Trail_Enduro_Model_Range_500-550_lbs.jpg?v=1791294416"},{"product_id":"sprindex-shock-spring-sprindex-trail-enduro-540-610-lbs-1","title":"Shock Spring Sprindex Trail \/ Enduro 540-610 lbs","description":"\u003cp\u003eSPRINDEX ALLOWS FOR TOOL-FREE, EASY ADJUSTMENT OF YOUR COIL'S SPRING RATE. Adjusting your shock's spring rate can profoundly improve your bike's handling and suspension. In fact, you may find yourself using different spring rates for different trails, depending on the conditions and type of trail. Or you may increase your spring rate for long climbs and decrease it for down hills. No expense was spared on the materials or manufacturing processed used. The coil itself is made of super high tensile spring steel similar to \"lightweight\" springs (which is why Sprindex is lighter than regular springs) in order to handle the stress of the system when adjusted to its highest spring rate setting, as well as reduce coil mass. The Sprindex assembly is made of glass reinforced polymer. The 5 included adapters are made of slippery Delrin. Spring rate is the force required to move a spring a given distance and independent of preload. For example, a \"400 lb\/in\" spring requires 400 pounds to move the spring 1 inch and 800 pounds to move a spring 2 inches. Preload is how much force is required to start moving the spring. Sprindex is patent pending in many countries. Follow your shock manufacturer's instructions for preload amount and sag and other shock adjustments. Do not preload your Sprindex more than 3 turns and 1 to 2 turns is preferred. Your Sprindex coil behaves like a regular coil that has a spring rate the same as your adjusted Sprindex spring rate. Adjusting your Sprindex does not change the length of the coil and so does not change your preload. Preload is adjusted normally and with the threaded ring that came with your shock. HOW DOES SPRINDEX ADJUST SPRING RATE? The spring rate of a spring is the amount of force it takes to deflect the spring a certain distance (typically pounds per inch or Newtons per mm). Spring rate is a function of 4 characteristics: wire diameter, coil diameter, material, and number of active coils. More active coils causes a lower spring rate and fewer active coils causes a higher spring rate. Think of it like this: the less wire there is to bend, the stiffer the spring. By twisting the Dial, Sprindex works by altering the number of active coils available for deflection. The adjusted spring rate is displayed through a window in the Dial. COIL SHOCKS VERSUS AIR SHOCKS Most agree that coil shocks outperform air shocks, assuming the right spring rate for the particular rider. Air shocks have significant \"stiction\" which is friction that resists the shock's initial movement. Coil shocks have much less stiction. Coil shocks soak up small bumps much better, better tire contact with the ground, give better traction, better ride quality, and make a rider measurably faster. So why are air shocks more common? The answer is lack of adjustability for coils and weight. Traditional coils have a fixed spring rate and spring rate has a dramatic effect on riding performance and feel. Most people ride the wrong spring rate because springs are typically only available in wide increments. Spring rate has a profound effect on bike performance. Coil shocks also weigh more than air shocks, but when using the right spring rate, the small weight penalty is easily worth it. Besides, Sprindex is lighter than ordinary shock springs. SPRING RATE IS DIFFERENT FROM PRELOAD Coil shocks include a threaded ring for preloading the coil. However, preloading is not the same as using a stiffer (higher spring rate) spring. Sprindex Preload A sprindex coil behaves exactly like a regular coil of the selected spring rate. For example, Sprindex adjusted to 435 lb\/in behaves just like a custom made 435 lb\/in standard coil. Poor small bump absorption resulting in a harsh ride and poor traction because it increases force to start coil movement. Either reduces shock travel and\/or over-stresses spring. Improper SAG. SAG must be achieved by spring rate, not preload. Doesn't change coil spring rate. If you bottom out with a spring, heavy preloading may not solve this and will mess up the rest of the stroke. Mountain bike shocks are designed for as little preload as is necessary to take play out of the system. Any more preload than this harms ride performance. SPRINDEX IS PROGRESSIVE Besides having an adjustable spring rate, Sprindex is also progressive. Sprindex is specifically designed to have a progressive spring rate for the last 20% of stroke for big hit support and for bikes with a linear linkage design. Coil versus Air: A coil is usually very linear, whereas an air shock starts out Regressive (a reducing spring rate), and then turns progressive (an increasing spring rate). See the chart below. One of the disadvantages to using an Air shock is that its regressiveness mean less small bump sensitivity and traction. This is partly why Air shocks are not as plush as Coil. Regardless of your bike's suspension design, Sprindex being linear between about 0-80% stroke and progressive between about 80% and 100% stroke works great because it provides unbeatable sensitivity and traction through all the small and medium movement and it provides progressive support for big hits. Most importantly, Sprindex also provides spring rate adjustment in order to fine tune the perfect spring rate so that you maximize your suspension performance. Performance Adapters Performance Adapters are included. Sprindex coils fit a wide variety of shocks, but you must use the Performance Adapters for most of them. Our Performance Adapters both improve the fit between the coil and your shock and are made of low friction Delrin to improve shock performance by allowing the spring to twist during high deflection. Also, the Performance Adapters help prevent the preload ring from self-adjusting due to coil windup. See bottom of Performance Adapter for instruction of which Performance Adapter you should use. For Rockshox, no Performance Adapter is required but we recommend you use the Performance Washer adapter for shock performance and to help prevent preload self-adjustment.\u003c\/p\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748551954480,"sku":"SD40550-RP","price":269.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/Shock_Spring_Sprindex_Trail_Enduro_Model_Range_540-610_lbs.jpg?v=1791294417"},{"product_id":"sprindex-shock-spring-sprindex-downhill-290-320-lbs-2","title":"Shock Spring Sprindex Downhill 290-320 lbs","description":"\u003cp\u003eSPRINDEX ALLOWS FOR TOOL-FREE, EASY ADJUSTMENT OF YOUR COIL'S SPRING RATE. Adjusting your shock's spring rate can profoundly improve your bike's handling and suspension. In fact, you may find yourself using different spring rates for different trails, depending on the conditions and type of trail. Or you may increase your spring rate for long climbs and decrease it for down hills. No expense was spared on the materials or manufacturing processed used. The coil itself is made of super high tensile spring steel similar to \"lightweight\" springs (which is why Sprindex is lighter than regular springs) in order to handle the stress of the system when adjusted to its highest spring rate setting, as well as reduce coil mass. The Sprindex assembly is made of glass reinforced polymer. The 5 included adapters are made of slippery Delrin. Spring rate is the force required to move a spring a given distance and independent of preload. For example, a \"400 lb\/in\" spring requires 400 pounds to move the spring 1 inch and 800 pounds to move a spring 2 inches. Preload is how much force is required to start moving the spring. Sprindex is patent pending in many countries. Follow your shock manufacturer's instructions for preload amount and sag and other shock adjustments. Do not preload your Sprindex more than 3 turns and 1 to 2 turns is preferred. Your Sprindex coil behaves like a regular coil that has a spring rate the same as your adjusted Sprindex spring rate. Adjusting your Sprindex does not change the length of the coil and so does not change your preload. Preload is adjusted normally and with the threaded ring that came with your shock. HOW DOES SPRINDEX ADJUST SPRING RATE? The spring rate of a spring is the amount of force it takes to deflect the spring a certain distance (typically pounds per inch or Newtons per mm). Spring rate is a function of 4 characteristics: wire diameter, coil diameter, material, and number of active coils. More active coils causes a lower spring rate and fewer active coils causes a higher spring rate. Think of it like this: the less wire there is to bend, the stiffer the spring. By twisting the Dial, Sprindex works by altering the number of active coils available for deflection. The adjusted spring rate is displayed through a window in the Dial. COIL SHOCKS VERSUS AIR SHOCKS Most agree that coil shocks outperform air shocks, assuming the right spring rate for the particular rider. Air shocks have significant \"stiction\" which is friction that resists the shock's initial movement. Coil shocks have much less stiction. Coil shocks soak up small bumps much better, better tire contact with the ground, give better traction, better ride quality, and make a rider measurably faster. So why are air shocks more common? The answer is lack of adjustability for coils and weight. Traditional coils have a fixed spring rate and spring rate has a dramatic effect on riding performance and feel. Most people ride the wrong spring rate because springs are typically only available in wide increments. Spring rate has a profound effect on bike performance. Coil shocks also weigh more than air shocks, but when using the right spring rate, the small weight penalty is easily worth it. Besides, Sprindex is lighter than ordinary shock springs. SPRING RATE IS DIFFERENT FROM PRELOAD Coil shocks include a threaded ring for preloading the coil. However, preloading is not the same as using a stiffer (higher spring rate) spring. Sprindex Preload A sprindex coil behaves exactly like a regular coil of the selected spring rate. For example, Sprindex adjusted to 435 lb\/in behaves just like a custom made 435 lb\/in standard coil. Poor small bump absorption resulting in a harsh ride and poor traction because it increases force to start coil movement. Either reduces shock travel and\/or over-stresses spring. Improper SAG. SAG must be achieved by spring rate, not preload. Doesn't change coil spring rate. If you bottom out with a spring, heavy preloading may not solve this and will mess up the rest of the stroke. Mountain bike shocks are designed for as little preload as is necessary to take play out of the system. Any more preload than this harms ride performance. SPRINDEX IS PROGRESSIVE Besides having an adjustable spring rate, Sprindex is also progressive. Sprindex is specifically designed to have a progressive spring rate for the last 20% of stroke for big hit support and for bikes with a linear linkage design. Coil versus Air: A coil is usually very linear, whereas an air shock starts out Regressive (a reducing spring rate), and then turns progressive (an increasing spring rate). See the chart below. One of the disadvantages to using an Air shock is that its regressiveness mean less small bump sensitivity and traction. This is partly why Air shocks are not as plush as Coil. Regardless of your bike's suspension design, Sprindex being linear between about 0-80% stroke and progressive between about 80% and 100% stroke works great because it provides unbeatable sensitivity and traction through all the small and medium movement and it provides progressive support for big hits. Most importantly, Sprindex also provides spring rate adjustment in order to fine tune the perfect spring rate so that you maximize your suspension performance. Performance Adapters Performance Adapters are included. Sprindex coils fit a wide variety of shocks, but you must use the Performance Adapters for most of them. Our Performance Adapters both improve the fit between the coil and your shock and are made of low friction Delrin to improve shock performance by allowing the spring to twist during high deflection. Also, the Performance Adapters help prevent the preload ring from self-adjusting due to coil windup. See bottom of Performance Adapter for instruction of which Performance Adapter you should use. For Rockshox, no Performance Adapter is required but we recommend you use the Performance Washer adapter for shock performance and to help prevent preload self-adjustment.\u003c\/p\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748552314928,"sku":"SD60300-RP","price":269.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/Shock_Spring_Sprindex_Downhill_Model_Range_290-320_lbs_12d0e787-433b-4923-9d53-3786c0315dfe.jpg?v=1791294421"},{"product_id":"sprindex-shock-spring-sprindex-downhill-450-490-lbs-2","title":"Shock Spring Sprindex Downhill 450-490 lbs","description":"\u003cp\u003eSPRINDEX ALLOWS FOR TOOL-FREE, EASY ADJUSTMENT OF YOUR COIL'S SPRING RATE. Adjusting your shock's spring rate can profoundly improve your bike's handling and suspension. In fact, you may find yourself using different spring rates for different trails, depending on the conditions and type of trail. Or you may increase your spring rate for long climbs and decrease it for down hills. No expense was spared on the materials or manufacturing processed used. The coil itself is made of super high tensile spring steel similar to \"lightweight\" springs (which is why Sprindex is lighter than regular springs) in order to handle the stress of the system when adjusted to its highest spring rate setting, as well as reduce coil mass. The Sprindex assembly is made of glass reinforced polymer. The 5 included adapters are made of slippery Delrin. Spring rate is the force required to move a spring a given distance and independent of preload. For example, a \"400 lb\/in\" spring requires 400 pounds to move the spring 1 inch and 800 pounds to move a spring 2 inches. Preload is how much force is required to start moving the spring. Sprindex is patent pending in many countries. Follow your shock manufacturer's instructions for preload amount and sag and other shock adjustments. Do not preload your Sprindex more than 3 turns and 1 to 2 turns is preferred. Your Sprindex coil behaves like a regular coil that has a spring rate the same as your adjusted Sprindex spring rate. Adjusting your Sprindex does not change the length of the coil and so does not change your preload. Preload is adjusted normally and with the threaded ring that came with your shock. HOW DOES SPRINDEX ADJUST SPRING RATE? The spring rate of a spring is the amount of force it takes to deflect the spring a certain distance (typically pounds per inch or Newtons per mm). Spring rate is a function of 4 characteristics: wire diameter, coil diameter, material, and number of active coils. More active coils causes a lower spring rate and fewer active coils causes a higher spring rate. Think of it like this: the less wire there is to bend, the stiffer the spring. By twisting the Dial, Sprindex works by altering the number of active coils available for deflection. The adjusted spring rate is displayed through a window in the Dial. COIL SHOCKS VERSUS AIR SHOCKS Most agree that coil shocks outperform air shocks, assuming the right spring rate for the particular rider. Air shocks have significant \"stiction\" which is friction that resists the shock's initial movement. Coil shocks have much less stiction. Coil shocks soak up small bumps much better, better tire contact with the ground, give better traction, better ride quality, and make a rider measurably faster. So why are air shocks more common? The answer is lack of adjustability for coils and weight. Traditional coils have a fixed spring rate and spring rate has a dramatic effect on riding performance and feel. Most people ride the wrong spring rate because springs are typically only available in wide increments. Spring rate has a profound effect on bike performance. Coil shocks also weigh more than air shocks, but when using the right spring rate, the small weight penalty is easily worth it. Besides, Sprindex is lighter than ordinary shock springs. SPRING RATE IS DIFFERENT FROM PRELOAD Coil shocks include a threaded ring for preloading the coil. However, preloading is not the same as using a stiffer (higher spring rate) spring. Sprindex Preload A sprindex coil behaves exactly like a regular coil of the selected spring rate. For example, Sprindex adjusted to 435 lb\/in behaves just like a custom made 435 lb\/in standard coil. Poor small bump absorption resulting in a harsh ride and poor traction because it increases force to start coil movement. Either reduces shock travel and\/or over-stresses spring. Improper SAG. SAG must be achieved by spring rate, not preload. Doesn't change coil spring rate. If you bottom out with a spring, heavy preloading may not solve this and will mess up the rest of the stroke. Mountain bike shocks are designed for as little preload as is necessary to take play out of the system. Any more preload than this harms ride performance. SPRINDEX IS PROGRESSIVE Besides having an adjustable spring rate, Sprindex is also progressive. Sprindex is specifically designed to have a progressive spring rate for the last 20% of stroke for big hit support and for bikes with a linear linkage design. Coil versus Air: A coil is usually very linear, whereas an air shock starts out Regressive (a reducing spring rate), and then turns progressive (an increasing spring rate). See the chart below. One of the disadvantages to using an Air shock is that its regressiveness mean less small bump sensitivity and traction. This is partly why Air shocks are not as plush as Coil. Regardless of your bike's suspension design, Sprindex being linear between about 0-80% stroke and progressive between about 80% and 100% stroke works great because it provides unbeatable sensitivity and traction through all the small and medium movement and it provides progressive support for big hits. Most importantly, Sprindex also provides spring rate adjustment in order to fine tune the perfect spring rate so that you maximize your suspension performance. Performance Adapters Performance Adapters are included. Sprindex coils fit a wide variety of shocks, but you must use the Performance Adapters for most of them. Our Performance Adapters both improve the fit between the coil and your shock and are made of low friction Delrin to improve shock performance by allowing the spring to twist during high deflection. Also, the Performance Adapters help prevent the preload ring from self-adjusting due to coil windup. See bottom of Performance Adapter for instruction of which Performance Adapter you should use. For Rockshox, no Performance Adapter is required but we recommend you use the Performance Washer adapter for shock performance and to help prevent preload self-adjustment.\u003c\/p\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748552347696,"sku":"SD60450-RP","price":269.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/Shock_Spring_Sprindex_Downhill_Model_Range_450-490_lbs_14eca248-99e4-45d2-bd99-54a22b2e35bf.jpg?v=1791294420"},{"product_id":"sprindex-shock-spring-sprindex-downhill-490-560-lbs-1","title":"Shock Spring Sprindex Downhill 490-560 lbs","description":"\u003cp\u003e\u003cstrong\u003eSprindex Adjustable Downhill Coil Spring (490–560 lbs \/ 75mm Stroke)\u003c\/strong\u003e\u003c\/p\u003e\r\n\u003cp\u003eAchieve the ultimate rear suspension setup without the hassle of swapping traditional coils. The Sprindex Downhill Coil Spring brings tool-free, micro-adjustable spring rate tuning to your coil shock, allowing you to fine-tune your sag, adapt to changing trail conditions, or stiffen your rate for long climbs. Engineered from super high-tensile spring steel and lightweight glass-reinforced polymer, Sprindex delivers custom coil performance in a lightweight package.\u003c\/p\u003e\r\n\u003ch3\u003eHow Sprindex Works\u003c\/h3\u003e\r\n\u003cp\u003eSpring rate is determined by active coil length. By turning the Sprindex dial, the system alters the number of active coils available for deflection—adjusting your spring rate without changing coil length or affecting your preload setting. The selected spring rate is clearly displayed through the window on the dial, giving you precise control over your suspension's performance.\u003c\/p\u003e\r\n\u003ch3\u003eProgressive End-Stroke Support\u003c\/h3\u003e\r\n\u003cp\u003eWhile traditional coils are strictly linear, Sprindex features a progressive spring rate through the final 20% of its stroke (80–100%). This provides supple small-bump traction and plushness through the initial travel, combined with ramped-up bottom-out resistance for big hits, heavy drops, and linear frame linkages.\u003c\/p\u003e\r\n\u003ch3\u003eKey Features\u003c\/h3\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eTool-Free Adjustment:\u003c\/strong\u003e Easily turn the dial to adjust spring rate anywhere between 490 lbs\/in and 560 lbs\/in.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eSuper High-Tensile Steel:\u003c\/strong\u003e Stronger and lighter than standard coil springs, reducing overall coil mass while handling high stress.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eLow-Friction Delrin Adapters:\u003c\/strong\u003e Includes 5 performance adapters to ensure smooth fitment across a wide range of shock models while preventing coil-windup and preload ring self-adjustment.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eIndependent Preload:\u003c\/strong\u003e Adjusting spring rate does not affect preload, ensuring your sag is always achieved through proper rate rather than excessive preloading.\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eSpring Rate Range:\u003c\/strong\u003e 490–560 lbs\/in (micro-adjustable)\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eStroke:\u003c\/strong\u003e 75 mm\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eLength (without adapters):\u003c\/strong\u003e 160 mm\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 563 g\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Super high-tensile steel coil, glass-reinforced polymer dial assembly, Delrin adapters\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits most major coil shock brands using included adapters (RockShox performance washer included)\u003c\/li\u003e\r\n\u003c\/ul\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748552544304,"sku":"SD60500-RP","price":269.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/75mm_Sprindex_Black_3a44d92e-e0ba-44be-916a-fdce2f3b7981.jpg?v=1791294422"},{"product_id":"sprindex-shock-spring-sprindex-downhill-570-630-lbs-2","title":"Shock Spring Sprindex Downhill 570-630 lbs","description":"\u003cp\u003eSPRINDEX ALLOWS FOR TOOL-FREE, EASY ADJUSTMENT OF YOUR COIL'S SPRING RATE. Adjusting your shock's spring rate can profoundly improve your bike's handling and suspension. In fact, you may find yourself using different spring rates for different trails, depending on the conditions and type of trail. Or you may increase your spring rate for long climbs and decrease it for down hills. No expense was spared on the materials or manufacturing processed used. The coil itself is made of super high tensile spring steel similar to \"lightweight\" springs (which is why Sprindex is lighter than regular springs) in order to handle the stress of the system when adjusted to its highest spring rate setting, as well as reduce coil mass. The Sprindex assembly is made of glass reinforced polymer. The 5 included adapters are made of slippery Delrin. Spring rate is the force required to move a spring a given distance and independent of preload. For example, a \"400 lb\/in\" spring requires 400 pounds to move the spring 1 inch and 800 pounds to move a spring 2 inches. Preload is how much force is required to start moving the spring. Sprindex is patent pending in many countries. Follow your shock manufacturer's instructions for preload amount and sag and other shock adjustments. Do not preload your Sprindex more than 3 turns and 1 to 2 turns is preferred. Your Sprindex coil behaves like a regular coil that has a spring rate the same as your adjusted Sprindex spring rate. Adjusting your Sprindex does not change the length of the coil and so does not change your preload. Preload is adjusted normally and with the threaded ring that came with your shock. HOW DOES SPRINDEX ADJUST SPRING RATE? The spring rate of a spring is the amount of force it takes to deflect the spring a certain distance (typically pounds per inch or Newtons per mm). Spring rate is a function of 4 characteristics: wire diameter, coil diameter, material, and number of active coils. More active coils causes a lower spring rate and fewer active coils causes a higher spring rate. Think of it like this: the less wire there is to bend, the stiffer the spring. By twisting the Dial, Sprindex works by altering the number of active coils available for deflection. The adjusted spring rate is displayed through a window in the Dial. COIL SHOCKS VERSUS AIR SHOCKS Most agree that coil shocks outperform air shocks, assuming the right spring rate for the particular rider. Air shocks have significant \"stiction\" which is friction that resists the shock's initial movement. Coil shocks have much less stiction. Coil shocks soak up small bumps much better, better tire contact with the ground, give better traction, better ride quality, and make a rider measurably faster. So why are air shocks more common? The answer is lack of adjustability for coils and weight. Traditional coils have a fixed spring rate and spring rate has a dramatic effect on riding performance and feel. Most people ride the wrong spring rate because springs are typically only available in wide increments. Spring rate has a profound effect on bike performance. Coil shocks also weigh more than air shocks, but when using the right spring rate, the small weight penalty is easily worth it. Besides, Sprindex is lighter than ordinary shock springs. SPRING RATE IS DIFFERENT FROM PRELOAD Coil shocks include a threaded ring for preloading the coil. However, preloading is not the same as using a stiffer (higher spring rate) spring. Sprindex Preload A sprindex coil behaves exactly like a regular coil of the selected spring rate. For example, Sprindex adjusted to 435 lb\/in behaves just like a custom made 435 lb\/in standard coil. Poor small bump absorption resulting in a harsh ride and poor traction because it increases force to start coil movement. Either reduces shock travel and\/or over-stresses spring. Improper SAG. SAG must be achieved by spring rate, not preload. Doesn't change coil spring rate. If you bottom out with a spring, heavy preloading may not solve this and will mess up the rest of the stroke. Mountain bike shocks are designed for as little preload as is necessary to take play out of the system. Any more preload than this harms ride performance. SPRINDEX IS PROGRESSIVE Besides having an adjustable spring rate, Sprindex is also progressive. Sprindex is specifically designed to have a progressive spring rate for the last 20% of stroke for big hit support and for bikes with a linear linkage design. Coil versus Air: A coil is usually very linear, whereas an air shock starts out Regressive (a reducing spring rate), and then turns progressive (an increasing spring rate). See the chart below. One of the disadvantages to using an Air shock is that its regressiveness mean less small bump sensitivity and traction. This is partly why Air shocks are not as plush as Coil. Regardless of your bike's suspension design, Sprindex being linear between about 0-80% stroke and progressive between about 80% and 100% stroke works great because it provides unbeatable sensitivity and traction through all the small and medium movement and it provides progressive support for big hits. Most importantly, Sprindex also provides spring rate adjustment in order to fine tune the perfect spring rate so that you maximize your suspension performance. Performance Adapters Performance Adapters are included. Sprindex coils fit a wide variety of shocks, but you must use the Performance Adapters for most of them. Our Performance Adapters both improve the fit between the coil and your shock and are made of low friction Delrin to improve shock performance by allowing the spring to twist during high deflection. Also, the Performance Adapters help prevent the preload ring from self-adjusting due to coil windup. See bottom of Performance Adapter for instruction of which Performance Adapter you should use. For Rockshox, no Performance Adapter is required but we recommend you use the Performance Washer adapter for shock performance and to help prevent preload self-adjustment.\u003c\/p\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748552675376,"sku":"SD60550-RP","price":269.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/Shock_Spring_Sprindex_Downhill_Model_Range_570-630_lbs_122324b5-a935-4147-a4d4-c8153f02ac8d.jpg?v=1791294423"},{"product_id":"sprindex-shock-spring-sprindex-light-trail-380-430-lbs-2","title":"Shock Spring Sprindex Light Trail 380-430 lbs","description":"\u003cp\u003eSPRINDEX ALLOWS FOR TOOL-FREE, EASY ADJUSTMENT OF YOUR COIL'S SPRING RATE. Adjusting your shock's spring rate can profoundly improve your bike's handling and suspension. In fact, you may find yourself using different spring rates for different trails, depending on the conditions and type of trail. Or you may increase your spring rate for long climbs and decrease it for down hills. No expense was spared on the materials or manufacturing processed used. The coil itself is made of super high tensile spring steel similar to \"lightweight\" springs (which is why Sprindex is lighter than regular springs) in order to handle the stress of the system when adjusted to its highest spring rate setting, as well as reduce coil mass. The Sprindex assembly is made of glass reinforced polymer. The 5 included adapters are made of slippery Delrin. Spring rate is the force required to move a spring a given distance and independent of preload. For example, a \"400 lb\/in\" spring requires 400 pounds to move the spring 1 inch and 800 pounds to move a spring 2 inches. Preload is how much force is required to start moving the spring. Sprindex is patent pending in many countries. Follow your shock manufacturer's instructions for preload amount and sag and other shock adjustments. Do not preload your Sprindex more than 3 turns and 1 to 2 turns is preferred. Your Sprindex coil behaves like a regular coil that has a spring rate the same as your adjusted Sprindex spring rate. Adjusting your Sprindex does not change the length of the coil and so does not change your preload. Preload is adjusted normally and with the threaded ring that came with your shock. HOW DOES SPRINDEX ADJUST SPRING RATE? The spring rate of a spring is the amount of force it takes to deflect the spring a certain distance (typically pounds per inch or Newtons per mm). Spring rate is a function of 4 characteristics: wire diameter, coil diameter, material, and number of active coils. More active coils causes a lower spring rate and fewer active coils causes a higher spring rate. Think of it like this: the less wire there is to bend, the stiffer the spring. By twisting the Dial, Sprindex works by altering the number of active coils available for deflection. The adjusted spring rate is displayed through a window in the Dial. COIL SHOCKS VERSUS AIR SHOCKS Most agree that coil shocks outperform air shocks, assuming the right spring rate for the particular rider. Air shocks have significant \"stiction\" which is friction that resists the shock's initial movement. Coil shocks have much less stiction. Coil shocks soak up small bumps much better, better tire contact with the ground, give better traction, better ride quality, and make a rider measurably faster. So why are air shocks more common? The answer is lack of adjustability for coils and weight. Traditional coils have a fixed spring rate and spring rate has a dramatic effect on riding performance and feel. Most people ride the wrong spring rate because springs are typically only available in wide increments. Spring rate has a profound effect on bike performance. Coil shocks also weigh more than air shocks, but when using the right spring rate, the small weight penalty is easily worth it. Besides, Sprindex is lighter than ordinary shock springs. SPRING RATE IS DIFFERENT FROM PRELOAD Coil shocks include a threaded ring for preloading the coil. However, preloading is not the same as using a stiffer (higher spring rate) spring. Sprindex Preload A sprindex coil behaves exactly like a regular coil of the selected spring rate. For example, Sprindex adjusted to 435 lb\/in behaves just like a custom made 435 lb\/in standard coil. Poor small bump absorption resulting in a harsh ride and poor traction because it increases force to start coil movement. Either reduces shock travel and\/or over-stresses spring. Improper SAG. SAG must be achieved by spring rate, not preload. Doesn't change coil spring rate. If you bottom out with a spring, heavy preloading may not solve this and will mess up the rest of the stroke. Mountain bike shocks are designed for as little preload as is necessary to take play out of the system. Any more preload than this harms ride performance. SPRINDEX IS PROGRESSIVE Besides having an adjustable spring rate, Sprindex is also progressive. Sprindex is specifically designed to have a progressive spring rate for the last 20% of stroke for big hit support and for bikes with a linear linkage design. Coil versus Air: A coil is usually very linear, whereas an air shock starts out Regressive (a reducing spring rate), and then turns progressive (an increasing spring rate). See the chart below. One of the disadvantages to using an Air shock is that its regressiveness mean less small bump sensitivity and traction. This is partly why Air shocks are not as plush as Coil. Regardless of your bike's suspension design, Sprindex being linear between about 0-80% stroke and progressive between about 80% and 100% stroke works great because it provides unbeatable sensitivity and traction through all the small and medium movement and it provides progressive support for big hits. Most importantly, Sprindex also provides spring rate adjustment in order to fine tune the perfect spring rate so that you maximize your suspension performance. Performance Adapters Performance Adapters are included. Sprindex coils fit a wide variety of shocks, but you must use the Performance Adapters for most of them. Our Performance Adapters both improve the fit between the coil and your shock and are made of low friction Delrin to improve shock performance by allowing the spring to twist during high deflection. Also, the Performance Adapters help prevent the preload ring from self-adjusting due to coil windup. See bottom of Performance Adapter for instruction of which Performance Adapter you should use. For Rockshox, no Performance Adapter is required but we recommend you use the Performance Washer adapter for shock performance and to help prevent preload self-adjustment.\u003c\/p\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748552708144,"sku":"SD24400-RP","price":239.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/Shock_Spring_Sprindex_Light_Trail_Model_Range_380-430_lbs_df240df8-baa5-440c-8f2d-c257ad7d5880.jpg?v=1791294422"},{"product_id":"sprindex-shock-spring-sprindex-light-trail-430-500lbs-2","title":"Shock Spring Sprindex Light Trail 430-500lbs","description":"\u003cp\u003eSPRINDEX ALLOWS FOR TOOL-FREE, EASY ADJUSTMENT OF YOUR COIL'S SPRING RATE. Adjusting your shock's spring rate can profoundly improve your bike's handling and suspension. In fact, you may find yourself using different spring rates for different trails, depending on the conditions and type of trail. Or you may increase your spring rate for long climbs and decrease it for down hills. No expense was spared on the materials or manufacturing processed used. The coil itself is made of super high tensile spring steel similar to \"lightweight\" springs (which is why Sprindex is lighter than regular springs) in order to handle the stress of the system when adjusted to its highest spring rate setting, as well as reduce coil mass. The Sprindex assembly is made of glass reinforced polymer. The 5 included adapters are made of slippery Delrin. Spring rate is the force required to move a spring a given distance and independent of preload. For example, a \"400 lb\/in\" spring requires 400 pounds to move the spring 1 inch and 800 pounds to move a spring 2 inches. Preload is how much force is required to start moving the spring. Sprindex is patent pending in many countries. Follow your shock manufacturer's instructions for preload amount and sag and other shock adjustments. Do not preload your Sprindex more than 3 turns and 1 to 2 turns is preferred. Your Sprindex coil behaves like a regular coil that has a spring rate the same as your adjusted Sprindex spring rate. Adjusting your Sprindex does not change the length of the coil and so does not change your preload. Preload is adjusted normally and with the threaded ring that came with your shock. HOW DOES SPRINDEX ADJUST SPRING RATE? The spring rate of a spring is the amount of force it takes to deflect the spring a certain distance (typically pounds per inch or Newtons per mm). Spring rate is a function of 4 characteristics: wire diameter, coil diameter, material, and number of active coils. More active coils causes a lower spring rate and fewer active coils causes a higher spring rate. Think of it like this: the less wire there is to bend, the stiffer the spring. By twisting the Dial, Sprindex works by altering the number of active coils available for deflection. The adjusted spring rate is displayed through a window in the Dial. COIL SHOCKS VERSUS AIR SHOCKS Most agree that coil shocks outperform air shocks, assuming the right spring rate for the particular rider. Air shocks have significant \"stiction\" which is friction that resists the shock's initial movement. Coil shocks have much less stiction. Coil shocks soak up small bumps much better, better tire contact with the ground, give better traction, better ride quality, and make a rider measurably faster. So why are air shocks more common? The answer is lack of adjustability for coils and weight. Traditional coils have a fixed spring rate and spring rate has a dramatic effect on riding performance and feel. Most people ride the wrong spring rate because springs are typically only available in wide increments. Spring rate has a profound effect on bike performance. Coil shocks also weigh more than air shocks, but when using the right spring rate, the small weight penalty is easily worth it. Besides, Sprindex is lighter than ordinary shock springs. SPRING RATE IS DIFFERENT FROM PRELOAD Coil shocks include a threaded ring for preloading the coil. However, preloading is not the same as using a stiffer (higher spring rate) spring. Sprindex Preload A sprindex coil behaves exactly like a regular coil of the selected spring rate. For example, Sprindex adjusted to 435 lb\/in behaves just like a custom made 435 lb\/in standard coil. Poor small bump absorption resulting in a harsh ride and poor traction because it increases force to start coil movement. Either reduces shock travel and\/or over-stresses spring. Improper SAG. SAG must be achieved by spring rate, not preload. Doesn't change coil spring rate. If you bottom out with a spring, heavy preloading may not solve this and will mess up the rest of the stroke. Mountain bike shocks are designed for as little preload as is necessary to take play out of the system. Any more preload than this harms ride performance. SPRINDEX IS PROGRESSIVE Besides having an adjustable spring rate, Sprindex is also progressive. Sprindex is specifically designed to have a progressive spring rate for the last 20% of stroke for big hit support and for bikes with a linear linkage design. Coil versus Air: A coil is usually very linear, whereas an air shock starts out Regressive (a reducing spring rate), and then turns progressive (an increasing spring rate). See the chart below. One of the disadvantages to using an Air shock is that its regressiveness mean less small bump sensitivity and traction. This is partly why Air shocks are not as plush as Coil. Regardless of your bike's suspension design, Sprindex being linear between about 0-80% stroke and progressive between about 80% and 100% stroke works great because it provides unbeatable sensitivity and traction through all the small and medium movement and it provides progressive support for big hits. Most importantly, Sprindex also provides spring rate adjustment in order to fine tune the perfect spring rate so that you maximize your suspension performance. Performance Adapters Performance Adapters are included. Sprindex coils fit a wide variety of shocks, but you must use the Performance Adapters for most of them. Our Performance Adapters both improve the fit between the coil and your shock and are made of low friction Delrin to improve shock performance by allowing the spring to twist during high deflection. Also, the Performance Adapters help prevent the preload ring from self-adjusting due to coil windup. See bottom of Performance Adapter for instruction of which Performance Adapter you should use. For Rockshox, no Performance Adapter is required but we recommend you use the Performance Washer adapter for shock performance and to help prevent preload self-adjustment.\u003c\/p\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748552839216,"sku":"SD24450-RP","price":239.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/Shock_Spring_Sprindex_Light_Trail_Model_Range_430-500_lbs_Stroke_55_mm_7f5bfc18-e3d1-4c9a-8e75-744c207d65ba.jpg?v=1791294424"},{"product_id":"sprindex-shock-spring-sprindex-light-trail-450-540-lbs-1","title":"Shock Spring Sprindex Light Trail 450-540 lbs","description":"\u003cp\u003e\u003cstrong\u003eSprindex Light Trail Adjustable Coil Shock Shock Spring (450–540 lbs \/ 55mm Stroke)\u003c\/strong\u003e\u003c\/p\u003e\r\n\u003cp\u003eWe make things that work better and last longer. Our products solve real problems with clean design and honest materials. The Sprindex Light Trail combines the unmatched small-bump sensitivity, traction, and ride quality of a high-performance coil shock with revolutionary, tool-free spring rate adjustability.\u003c\/p\u003e\r\n\u003cp\u003eTraditional coil springs lock you into a single fixed rate, forcing you to compromise between climbing efficiency and descending support. Sprindex solves this by altering the number of active coils via an easy-to-twist dial. Adjust your spring rate higher for long, grinding climbs, and dial it back down for plush, high-speed descents—all without changing your preload or swapping springs.\u003c\/p\u003e\r\n\u003ch3\u003eKey Features\u003c\/h3\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eTool-Free Spring Rate Adjustability:\u003c\/strong\u003e Easily twist the dial to fine-tune your spring rate anywhere between 450 lbs and 540 lbs to match the trail, conditions, or your riding style.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eProgressive Finish:\u003c\/strong\u003e Engineered with a progressive spring rate over the final 20% of the stroke to provide exceptional big-hit support and pair seamlessly with linear suspension linkages.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eUltra-Lightweight High-Tensile Steel:\u003c\/strong\u003e Utilizes premium, highest-grade spring steel to reduce coil mass while safely handling extreme stress at maximum settings.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eLow-Friction Delrin Performance Adapters:\u003c\/strong\u003e Includes 5 specialized performance adapters that optimize fit across a wide variety of shock bodies while allowing the spring to twist smoothly during high deflection, preventing preload self-adjustment.\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eBrand \/ Model:\u003c\/strong\u003e Sprindex Light Trail\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eSpring Rate Range:\u003c\/strong\u003e 450 lbs – 540 lbs \/ in\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eStroke:\u003c\/strong\u003e 55 mm \/ 2.2 inches\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eSpring Length:\u003c\/strong\u003e 126 mm\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 437g\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eMaterials:\u003c\/strong\u003e Super High-Tensile Spring Steel (Coil), Glass-Reinforced Polymer (Assembly Dial), Delrin (Performance Adapters)\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eItem Fit \u0026amp; Compatibility Tools:\u003c\/strong\u003e \u003ca href=\"https:\/\/sprindex.com\/pages\/sprindex-finder\" target=\"_blank\" rel=\"noopener\"\u003eSprindex Finder Fit Tool\u003c\/a\u003e | \u003ca href=\"https:\/\/sprindex.com\/pages\/compatibility\" target=\"_blank\" rel=\"noopener\"\u003eCompatibility Guide\u003c\/a\u003e\n\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\u003ch3\u003ePackage List\u003c\/h3\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e1 x Sprindex Light Trail Adjustable Coil Spring (450-540 lbs)\u003c\/li\u003e\r\n\u003cli\u003e1 x Integrated Adjustment Dial\u003c\/li\u003e\r\n\u003cli\u003e5 x Performance Adapters (Delrin)\u003c\/li\u003e\r\n\u003cli\u003e1 x User Manual \/ Setup Guide\u003c\/li\u003e\r\n\u003c\/ul\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748552871984,"sku":"SD24500-RP","price":269.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/55mm_Sprindex_Black_524e96fe-42ea-45e5-8eba-99e6a9d2ec98.png?v=1791294425"},{"product_id":"sprindex-shock-spring-sprindex-light-trail-550-610-lbs-2","title":"Shock Spring Sprindex Light Trail 550-610 lbs","description":"\u003cp\u003eSPRINDEX ALLOWS FOR TOOL-FREE, EASY ADJUSTMENT OF YOUR COIL'S SPRING RATE. Adjusting your shock's spring rate can profoundly improve your bike's handling and suspension. In fact, you may find yourself using different spring rates for different trails, depending on the conditions and type of trail. Or you may increase your spring rate for long climbs and decrease it for down hills. No expense was spared on the materials or manufacturing processed used. The coil itself is made of super high tensile spring steel similar to \"lightweight\" springs (which is why Sprindex is lighter than regular springs) in order to handle the stress of the system when adjusted to its highest spring rate setting, as well as reduce coil mass. The Sprindex assembly is made of glass reinforced polymer. The 5 included adapters are made of slippery Delrin. Spring rate is the force required to move a spring a given distance and independent of preload. For example, a \"400 lb\/in\" spring requires 400 pounds to move the spring 1 inch and 800 pounds to move a spring 2 inches. Preload is how much force is required to start moving the spring. Sprindex is patent pending in many countries. Follow your shock manufacturer's instructions for preload amount and sag and other shock adjustments. Do not preload your Sprindex more than 3 turns and 1 to 2 turns is preferred. Your Sprindex coil behaves like a regular coil that has a spring rate the same as your adjusted Sprindex spring rate. Adjusting your Sprindex does not change the length of the coil and so does not change your preload. Preload is adjusted normally and with the threaded ring that came with your shock. HOW DOES SPRINDEX ADJUST SPRING RATE? The spring rate of a spring is the amount of force it takes to deflect the spring a certain distance (typically pounds per inch or Newtons per mm). Spring rate is a function of 4 characteristics: wire diameter, coil diameter, material, and number of active coils. More active coils causes a lower spring rate and fewer active coils causes a higher spring rate. Think of it like this: the less wire there is to bend, the stiffer the spring. By twisting the Dial, Sprindex works by altering the number of active coils available for deflection. The adjusted spring rate is displayed through a window in the Dial. COIL SHOCKS VERSUS AIR SHOCKS Most agree that coil shocks outperform air shocks, assuming the right spring rate for the particular rider. Air shocks have significant \"stiction\" which is friction that resists the shock's initial movement. Coil shocks have much less stiction. Coil shocks soak up small bumps much better, better tire contact with the ground, give better traction, better ride quality, and make a rider measurably faster. So why are air shocks more common? The answer is lack of adjustability for coils and weight. Traditional coils have a fixed spring rate and spring rate has a dramatic effect on riding performance and feel. Most people ride the wrong spring rate because springs are typically only available in wide increments. Spring rate has a profound effect on bike performance. Coil shocks also weigh more than air shocks, but when using the right spring rate, the small weight penalty is easily worth it. Besides, Sprindex is lighter than ordinary shock springs. SPRING RATE IS DIFFERENT FROM PRELOAD Coil shocks include a threaded ring for preloading the coil. However, preloading is not the same as using a stiffer (higher spring rate) spring. Sprindex Preload A sprindex coil behaves exactly like a regular coil of the selected spring rate. For example, Sprindex adjusted to 435 lb\/in behaves just like a custom made 435 lb\/in standard coil. Poor small bump absorption resulting in a harsh ride and poor traction because it increases force to start coil movement. Either reduces shock travel and\/or over-stresses spring. Improper SAG. SAG must be achieved by spring rate, not preload. Doesn't change coil spring rate. If you bottom out with a spring, heavy preloading may not solve this and will mess up the rest of the stroke. Mountain bike shocks are designed for as little preload as is necessary to take play out of the system. Any more preload than this harms ride performance. SPRINDEX IS PROGRESSIVE Besides having an adjustable spring rate, Sprindex is also progressive. Sprindex is specifically designed to have a progressive spring rate for the last 20% of stroke for big hit support and for bikes with a linear linkage design. Coil versus Air: A coil is usually very linear, whereas an air shock starts out Regressive (a reducing spring rate), and then turns progressive (an increasing spring rate). See the chart below. One of the disadvantages to using an Air shock is that its regressiveness mean less small bump sensitivity and traction. This is partly why Air shocks are not as plush as Coil. Regardless of your bike's suspension design, Sprindex being linear between about 0-80% stroke and progressive between about 80% and 100% stroke works great because it provides unbeatable sensitivity and traction through all the small and medium movement and it provides progressive support for big hits. Most importantly, Sprindex also provides spring rate adjustment in order to fine tune the perfect spring rate so that you maximize your suspension performance. Performance Adapters Performance Adapters are included. Sprindex coils fit a wide variety of shocks, but you must use the Performance Adapters for most of them. Our Performance Adapters both improve the fit between the coil and your shock and are made of low friction Delrin to improve shock performance by allowing the spring to twist during high deflection. Also, the Performance Adapters help prevent the preload ring from self-adjusting due to coil windup. See bottom of Performance Adapter for instruction of which Performance Adapter you should use. For Rockshox, no Performance Adapter is required but we recommend you use the Performance Washer adapter for shock performance and to help prevent preload self-adjustment.\u003c\/p\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748552970288,"sku":"SD24550-RP","price":269.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/Shock_Spring_Sprindex_Light_Trail_Model_Range_550-610_lbs_e8058019-0860-4b9e-b976-68ebe946385a.jpg?v=1791294425"},{"product_id":"sprindex-shock-spring-sprindex-light-trail-610-690-lbs-2","title":"Shock Spring Sprindex Light Trail 610-690 lbs","description":"\u003cp\u003eSPRINDEX ALLOWS FOR TOOL-FREE, EASY ADJUSTMENT OF YOUR COIL'S SPRING RATE. Adjusting your shock's spring rate can profoundly improve your bike's handling and suspension. In fact, you may find yourself using different spring rates for different trails, depending on the conditions and type of trail. Or you may increase your spring rate for long climbs and decrease it for down hills. No expense was spared on the materials or manufacturing processed used. The coil itself is made of super high tensile spring steel similar to \"lightweight\" springs (which is why Sprindex is lighter than regular springs) in order to handle the stress of the system when adjusted to its highest spring rate setting, as well as reduce coil mass. The Sprindex assembly is made of glass reinforced polymer. The 5 included adapters are made of slippery Delrin. Spring rate is the force required to move a spring a given distance and independent of preload. For example, a \"400 lb\/in\" spring requires 400 pounds to move the spring 1 inch and 800 pounds to move a spring 2 inches. Preload is how much force is required to start moving the spring. Sprindex is patent pending in many countries. Follow your shock manufacturer's instructions for preload amount and sag and other shock adjustments. Do not preload your Sprindex more than 3 turns and 1 to 2 turns is preferred. Your Sprindex coil behaves like a regular coil that has a spring rate the same as your adjusted Sprindex spring rate. Adjusting your Sprindex does not change the length of the coil and so does not change your preload. Preload is adjusted normally and with the threaded ring that came with your shock. HOW DOES SPRINDEX ADJUST SPRING RATE? The spring rate of a spring is the amount of force it takes to deflect the spring a certain distance (typically pounds per inch or Newtons per mm). Spring rate is a function of 4 characteristics: wire diameter, coil diameter, material, and number of active coils. More active coils causes a lower spring rate and fewer active coils causes a higher spring rate. Think of it like this: the less wire there is to bend, the stiffer the spring. By twisting the Dial, Sprindex works by altering the number of active coils available for deflection. The adjusted spring rate is displayed through a window in the Dial. COIL SHOCKS VERSUS AIR SHOCKS Most agree that coil shocks outperform air shocks, assuming the right spring rate for the particular rider. Air shocks have significant \"stiction\" which is friction that resists the shock's initial movement. Coil shocks have much less stiction. Coil shocks soak up small bumps much better, better tire contact with the ground, give better traction, better ride quality, and make a rider measurably faster. So why are air shocks more common? The answer is lack of adjustability for coils and weight. Traditional coils have a fixed spring rate and spring rate has a dramatic effect on riding performance and feel. Most people ride the wrong spring rate because springs are typically only available in wide increments. Spring rate has a profound effect on bike performance. Coil shocks also weigh more than air shocks, but when using the right spring rate, the small weight penalty is easily worth it. Besides, Sprindex is lighter than ordinary shock springs. SPRING RATE IS DIFFERENT FROM PRELOAD Coil shocks include a threaded ring for preloading the coil. However, preloading is not the same as using a stiffer (higher spring rate) spring. Sprindex Preload A sprindex coil behaves exactly like a regular coil of the selected spring rate. For example, Sprindex adjusted to 435 lb\/in behaves just like a custom made 435 lb\/in standard coil. Poor small bump absorption resulting in a harsh ride and poor traction because it increases force to start coil movement. Either reduces shock travel and\/or over-stresses spring. Improper SAG. SAG must be achieved by spring rate, not preload. Doesn't change coil spring rate. If you bottom out with a spring, heavy preloading may not solve this and will mess up the rest of the stroke. Mountain bike shocks are designed for as little preload as is necessary to take play out of the system. Any more preload than this harms ride performance. SPRINDEX IS PROGRESSIVE Besides having an adjustable spring rate, Sprindex is also progressive. Sprindex is specifically designed to have a progressive spring rate for the last 20% of stroke for big hit support and for bikes with a linear linkage design. Coil versus Air: A coil is usually very linear, whereas an air shock starts out Regressive (a reducing spring rate), and then turns progressive (an increasing spring rate). See the chart below. One of the disadvantages to using an Air shock is that its regressiveness mean less small bump sensitivity and traction. This is partly why Air shocks are not as plush as Coil. Regardless of your bike's suspension design, Sprindex being linear between about 0-80% stroke and progressive between about 80% and 100% stroke works great because it provides unbeatable sensitivity and traction through all the small and medium movement and it provides progressive support for big hits. Most importantly, Sprindex also provides spring rate adjustment in order to fine tune the perfect spring rate so that you maximize your suspension performance. Performance Adapters Performance Adapters are included. Sprindex coils fit a wide variety of shocks, but you must use the Performance Adapters for most of them. Our Performance Adapters both improve the fit between the coil and your shock and are made of low friction Delrin to improve shock performance by allowing the spring to twist during high deflection. Also, the Performance Adapters help prevent the preload ring from self-adjusting due to coil windup. See bottom of Performance Adapter for instruction of which Performance Adapter you should use. For Rockshox, no Performance Adapter is required but we recommend you use the Performance Washer adapter for shock performance and to help prevent preload self-adjustment.\u003c\/p\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748553068592,"sku":"SD24620-RP","price":269.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/Shock_Spring_Sprindex_Light_Trail_Model__Range_610-690_lbs_883fbf26-b265-4d19-a332-c69373218684.jpg?v=1791294427"},{"product_id":"sprindex-shock-spring-sprindex-trail-enduro-340-380-lbs-2","title":"Shock Spring Sprindex Trail \/ Enduro 340-380 lbs","description":"\u003cp\u003eSPRINDEX ALLOWS FOR TOOL-FREE, EASY ADJUSTMENT OF YOUR COIL'S SPRING RATE. Adjusting your shock's spring rate can profoundly improve your bike's handling and suspension. In fact, you may find yourself using different spring rates for different trails, depending on the conditions and type of trail. Or you may increase your spring rate for long climbs and decrease it for down hills. No expense was spared on the materials or manufacturing processed used. The coil itself is made of super high tensile spring steel similar to \"lightweight\" springs (which is why Sprindex is lighter than regular springs) in order to handle the stress of the system when adjusted to its highest spring rate setting, as well as reduce coil mass. The Sprindex assembly is made of glass reinforced polymer. The 5 included adapters are made of slippery Delrin. Spring rate is the force required to move a spring a given distance and independent of preload. For example, a \"400 lb\/in\" spring requires 400 pounds to move the spring 1 inch and 800 pounds to move a spring 2 inches. Preload is how much force is required to start moving the spring. Sprindex is patent pending in many countries. Follow your shock manufacturer's instructions for preload amount and sag and other shock adjustments. Do not preload your Sprindex more than 3 turns and 1 to 2 turns is preferred. Your Sprindex coil behaves like a regular coil that has a spring rate the same as your adjusted Sprindex spring rate. Adjusting your Sprindex does not change the length of the coil and so does not change your preload. Preload is adjusted normally and with the threaded ring that came with your shock. HOW DOES SPRINDEX ADJUST SPRING RATE? The spring rate of a spring is the amount of force it takes to deflect the spring a certain distance (typically pounds per inch or Newtons per mm). Spring rate is a function of 4 characteristics: wire diameter, coil diameter, material, and number of active coils. More active coils causes a lower spring rate and fewer active coils causes a higher spring rate. Think of it like this: the less wire there is to bend, the stiffer the spring. By twisting the Dial, Sprindex works by altering the number of active coils available for deflection. The adjusted spring rate is displayed through a window in the Dial. COIL SHOCKS VERSUS AIR SHOCKS Most agree that coil shocks outperform air shocks, assuming the right spring rate for the particular rider. Air shocks have significant \"stiction\" which is friction that resists the shock's initial movement. Coil shocks have much less stiction. Coil shocks soak up small bumps much better, better tire contact with the ground, give better traction, better ride quality, and make a rider measurably faster. So why are air shocks more common? The answer is lack of adjustability for coils and weight. Traditional coils have a fixed spring rate and spring rate has a dramatic effect on riding performance and feel. Most people ride the wrong spring rate because springs are typically only available in wide increments. Spring rate has a profound effect on bike performance. Coil shocks also weigh more than air shocks, but when using the right spring rate, the small weight penalty is easily worth it. Besides, Sprindex is lighter than ordinary shock springs. SPRING RATE IS DIFFERENT FROM PRELOAD Coil shocks include a threaded ring for preloading the coil. However, preloading is not the same as using a stiffer (higher spring rate) spring. Sprindex Preload A sprindex coil behaves exactly like a regular coil of the selected spring rate. For example, Sprindex adjusted to 435 lb\/in behaves just like a custom made 435 lb\/in standard coil. Poor small bump absorption resulting in a harsh ride and poor traction because it increases force to start coil movement. Either reduces shock travel and\/or over-stresses spring. Improper SAG. SAG must be achieved by spring rate, not preload. Doesn't change coil spring rate. If you bottom out with a spring, heavy preloading may not solve this and will mess up the rest of the stroke. Mountain bike shocks are designed for as little preload as is necessary to take play out of the system. Any more preload than this harms ride performance. SPRINDEX IS PROGRESSIVE Besides having an adjustable spring rate, Sprindex is also progressive. Sprindex is specifically designed to have a progressive spring rate for the last 20% of stroke for big hit support and for bikes with a linear linkage design. Coil versus Air: A coil is usually very linear, whereas an air shock starts out Regressive (a reducing spring rate), and then turns progressive (an increasing spring rate). See the chart below. One of the disadvantages to using an Air shock is that its regressiveness mean less small bump sensitivity and traction. This is partly why Air shocks are not as plush as Coil. Regardless of your bike's suspension design, Sprindex being linear between about 0-80% stroke and progressive between about 80% and 100% stroke works great because it provides unbeatable sensitivity and traction through all the small and medium movement and it provides progressive support for big hits. Most importantly, Sprindex also provides spring rate adjustment in order to fine tune the perfect spring rate so that you maximize your suspension performance. Performance Adapters Performance Adapters are included. Sprindex coils fit a wide variety of shocks, but you must use the Performance Adapters for most of them. Our Performance Adapters both improve the fit between the coil and your shock and are made of low friction Delrin to improve shock performance by allowing the spring to twist during high deflection. Also, the Performance Adapters help prevent the preload ring from self-adjusting due to coil windup. See bottom of Performance Adapter for instruction of which Performance Adapter you should use. For Rockshox, no Performance Adapter is required but we recommend you use the Performance Washer adapter for shock performance and to help prevent preload self-adjustment.\u003c\/p\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748553101360,"sku":"SD40350-RP","price":269.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/Shock_Spring_Sprindex_Trail_Enduro_Model_Range_340-380_lbs_af7f873a-c296-4a32-880f-7da77e917dae.jpg?v=1791294427"},{"product_id":"sprindex-shock-spring-sprindex-trail-enduro-390-430lbs-2","title":"Shock Spring Sprindex Trail \/ Enduro 390-430lbs","description":"\u003cp\u003eSPRINDEX ALLOWS FOR TOOL-FREE, EASY ADJUSTMENT OF YOUR COIL'S SPRING RATE. Adjusting your shock's spring rate can profoundly improve your bike's handling and suspension. In fact, you may find yourself using different spring rates for different trails, depending on the conditions and type of trail. Or you may increase your spring rate for long climbs and decrease it for down hills. No expense was spared on the materials or manufacturing processed used. The coil itself is made of super high tensile spring steel similar to \"lightweight\" springs (which is why Sprindex is lighter than regular springs) in order to handle the stress of the system when adjusted to its highest spring rate setting, as well as reduce coil mass. The Sprindex assembly is made of glass reinforced polymer. The 5 included adapters are made of slippery Delrin. Spring rate is the force required to move a spring a given distance and independent of preload. For example, a \"400 lb\/in\" spring requires 400 pounds to move the spring 1 inch and 800 pounds to move a spring 2 inches. Preload is how much force is required to start moving the spring. Sprindex is patent pending in many countries. Follow your shock manufacturer's instructions for preload amount and sag and other shock adjustments. Do not preload your Sprindex more than 3 turns and 1 to 2 turns is preferred. Your Sprindex coil behaves like a regular coil that has a spring rate the same as your adjusted Sprindex spring rate. Adjusting your Sprindex does not change the length of the coil and so does not change your preload. Preload is adjusted normally and with the threaded ring that came with your shock. HOW DOES SPRINDEX ADJUST SPRING RATE? The spring rate of a spring is the amount of force it takes to deflect the spring a certain distance (typically pounds per inch or Newtons per mm). Spring rate is a function of 4 characteristics: wire diameter, coil diameter, material, and number of active coils. More active coils causes a lower spring rate and fewer active coils causes a higher spring rate. Think of it like this: the less wire there is to bend, the stiffer the spring. By twisting the Dial, Sprindex works by altering the number of active coils available for deflection. The adjusted spring rate is displayed through a window in the Dial. COIL SHOCKS VERSUS AIR SHOCKS Most agree that coil shocks outperform air shocks, assuming the right spring rate for the particular rider. Air shocks have significant \"stiction\" which is friction that resists the shock's initial movement. Coil shocks have much less stiction. Coil shocks soak up small bumps much better, better tire contact with the ground, give better traction, better ride quality, and make a rider measurably faster. So why are air shocks more common? The answer is lack of adjustability for coils and weight. Traditional coils have a fixed spring rate and spring rate has a dramatic effect on riding performance and feel. Most people ride the wrong spring rate because springs are typically only available in wide increments. Spring rate has a profound effect on bike performance. Coil shocks also weigh more than air shocks, but when using the right spring rate, the small weight penalty is easily worth it. Besides, Sprindex is lighter than ordinary shock springs. SPRING RATE IS DIFFERENT FROM PRELOAD Coil shocks include a threaded ring for preloading the coil. However, preloading is not the same as using a stiffer (higher spring rate) spring. Sprindex Preload A sprindex coil behaves exactly like a regular coil of the selected spring rate. For example, Sprindex adjusted to 435 lb\/in behaves just like a custom made 435 lb\/in standard coil. Poor small bump absorption resulting in a harsh ride and poor traction because it increases force to start coil movement. Either reduces shock travel and\/or over-stresses spring. Improper SAG. SAG must be achieved by spring rate, not preload. Doesn't change coil spring rate. If you bottom out with a spring, heavy preloading may not solve this and will mess up the rest of the stroke. Mountain bike shocks are designed for as little preload as is necessary to take play out of the system. Any more preload than this harms ride performance. SPRINDEX IS PROGRESSIVE Besides having an adjustable spring rate, Sprindex is also progressive. Sprindex is specifically designed to have a progressive spring rate for the last 20% of stroke for big hit support and for bikes with a linear linkage design. Coil versus Air: A coil is usually very linear, whereas an air shock starts out Regressive (a reducing spring rate), and then turns progressive (an increasing spring rate). See the chart below. One of the disadvantages to using an Air shock is that its regressiveness mean less small bump sensitivity and traction. This is partly why Air shocks are not as plush as Coil. Regardless of your bike's suspension design, Sprindex being linear between about 0-80% stroke and progressive between about 80% and 100% stroke works great because it provides unbeatable sensitivity and traction through all the small and medium movement and it provides progressive support for big hits. Most importantly, Sprindex also provides spring rate adjustment in order to fine tune the perfect spring rate so that you maximize your suspension performance. Performance Adapters Performance Adapters are included. Sprindex coils fit a wide variety of shocks, but you must use the Performance Adapters for most of them. Our Performance Adapters both improve the fit between the coil and your shock and are made of low friction Delrin to improve shock performance by allowing the spring to twist during high deflection. Also, the Performance Adapters help prevent the preload ring from self-adjusting due to coil windup. See bottom of Performance Adapter for instruction of which Performance Adapter you should use. For Rockshox, no Performance Adapter is required but we recommend you use the Performance Washer adapter for shock performance and to help prevent preload self-adjustment.\u003c\/p\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748553232432,"sku":"SD40400-RP","price":269.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/Shock_Spring_Sprindex_Trail_Enduro_Model__Range_390-430_lbs_c7d11225-34d8-42a7-b944-dbf0da08d84b.jpg?v=1791294428"},{"product_id":"sprindex-shock-spring-sprindex-trail-enduro-450-500lbs-2","title":"Shock Spring Sprindex Trail \/ Enduro 450-500lbs","description":"\u003cp\u003eSPRINDEX ALLOWS FOR TOOL-FREE, EASY ADJUSTMENT OF YOUR COIL'S SPRING RATE. Adjusting your shock's spring rate can profoundly improve your bike's handling and suspension. In fact, you may find yourself using different spring rates for different trails, depending on the conditions and type of trail. Or you may increase your spring rate for long climbs and decrease it for down hills. No expense was spared on the materials or manufacturing processed used. The coil itself is made of super high tensile spring steel similar to \"lightweight\" springs (which is why Sprindex is lighter than regular springs) in order to handle the stress of the system when adjusted to its highest spring rate setting, as well as reduce coil mass. The Sprindex assembly is made of glass reinforced polymer. The 5 included adapters are made of slippery Delrin. Spring rate is the force required to move a spring a given distance and independent of preload. For example, a \"400 lb\/in\" spring requires 400 pounds to move the spring 1 inch and 800 pounds to move a spring 2 inches. Preload is how much force is required to start moving the spring. Sprindex is patent pending in many countries. Follow your shock manufacturer's instructions for preload amount and sag and other shock adjustments. Do not preload your Sprindex more than 3 turns and 1 to 2 turns is preferred. Your Sprindex coil behaves like a regular coil that has a spring rate the same as your adjusted Sprindex spring rate. Adjusting your Sprindex does not change the length of the coil and so does not change your preload. Preload is adjusted normally and with the threaded ring that came with your shock. HOW DOES SPRINDEX ADJUST SPRING RATE? The spring rate of a spring is the amount of force it takes to deflect the spring a certain distance (typically pounds per inch or Newtons per mm). Spring rate is a function of 4 characteristics: wire diameter, coil diameter, material, and number of active coils. More active coils causes a lower spring rate and fewer active coils causes a higher spring rate. Think of it like this: the less wire there is to bend, the stiffer the spring. By twisting the Dial, Sprindex works by altering the number of active coils available for deflection. The adjusted spring rate is displayed through a window in the Dial. COIL SHOCKS VERSUS AIR SHOCKS Most agree that coil shocks outperform air shocks, assuming the right spring rate for the particular rider. Air shocks have significant \"stiction\" which is friction that resists the shock's initial movement. Coil shocks have much less stiction. Coil shocks soak up small bumps much better, better tire contact with the ground, give better traction, better ride quality, and make a rider measurably faster. So why are air shocks more common? The answer is lack of adjustability for coils and weight. Traditional coils have a fixed spring rate and spring rate has a dramatic effect on riding performance and feel. Most people ride the wrong spring rate because springs are typically only available in wide increments. Spring rate has a profound effect on bike performance. Coil shocks also weigh more than air shocks, but when using the right spring rate, the small weight penalty is easily worth it. Besides, Sprindex is lighter than ordinary shock springs. SPRING RATE IS DIFFERENT FROM PRELOAD Coil shocks include a threaded ring for preloading the coil. However, preloading is not the same as using a stiffer (higher spring rate) spring. Sprindex Preload A sprindex coil behaves exactly like a regular coil of the selected spring rate. For example, Sprindex adjusted to 435 lb\/in behaves just like a custom made 435 lb\/in standard coil. Poor small bump absorption resulting in a harsh ride and poor traction because it increases force to start coil movement. Either reduces shock travel and\/or over-stresses spring. Improper SAG. SAG must be achieved by spring rate, not preload. Doesn't change coil spring rate. If you bottom out with a spring, heavy preloading may not solve this and will mess up the rest of the stroke. Mountain bike shocks are designed for as little preload as is necessary to take play out of the system. Any more preload than this harms ride performance. SPRINDEX IS PROGRESSIVE Besides having an adjustable spring rate, Sprindex is also progressive. Sprindex is specifically designed to have a progressive spring rate for the last 20% of stroke for big hit support and for bikes with a linear linkage design. Coil versus Air: A coil is usually very linear, whereas an air shock starts out Regressive (a reducing spring rate), and then turns progressive (an increasing spring rate). See the chart below. One of the disadvantages to using an Air shock is that its regressiveness mean less small bump sensitivity and traction. This is partly why Air shocks are not as plush as Coil. Regardless of your bike's suspension design, Sprindex being linear between about 0-80% stroke and progressive between about 80% and 100% stroke works great because it provides unbeatable sensitivity and traction through all the small and medium movement and it provides progressive support for big hits. Most importantly, Sprindex also provides spring rate adjustment in order to fine tune the perfect spring rate so that you maximize your suspension performance. Performance Adapters Performance Adapters are included. Sprindex coils fit a wide variety of shocks, but you must use the Performance Adapters for most of them. Our Performance Adapters both improve the fit between the coil and your shock and are made of low friction Delrin to improve shock performance by allowing the spring to twist during high deflection. Also, the Performance Adapters help prevent the preload ring from self-adjusting due to coil windup. See bottom of Performance Adapter for instruction of which Performance Adapter you should use. For Rockshox, no Performance Adapter is required but we recommend you use the Performance Washer adapter for shock performance and to help prevent preload self-adjustment.\u003c\/p\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748553330736,"sku":"SD40450-RP","price":269.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/Shock_Spring_Sprindex_Trail_Enduro_Model_Range_450-500_lbs_74ba2675-3426-4615-80eb-8d76132bb38d.jpg?v=1791294429"},{"product_id":"sprindex-shock-spring-sprindex-trail-enduro-490-560-lbs-1","title":"Shock Spring Sprindex Trail \/ Enduro 490-560 lbs","description":"\u003cp\u003e\u003cstrong\u003eSprindex Adjustable Trail \/ Enduro Coil Shock Spring - 490-560 lbs (65mm Stroke)\u003c\/strong\u003e\u003c\/p\u003e\r\n\u003cp\u003e\u003cstrong\u003eSprindex allows for tool-free, easy adjustment of your coil's spring rate.\u003c\/strong\u003e Adjusting your shock's spring rate can profoundly improve your bike's handling and suspension performance. Depending on trail conditions, you can increase your spring rate for long, efficient climbs and decrease it for plush, controlled descents—or fine-tune your setup for different trails entirely.\u003c\/p\u003e\r\n\u003cp\u003eNo expense was spared on materials or manufacturing. The coil itself is made of super high tensile spring steel—similar to lightweight racing springs to reduce mass and withstand the extreme stresses of higher adjustment settings. The adjustment assembly is built from glass-reinforced polymer, and the included adapters are molded from slippery, low-friction Delrin.\u003c\/p\u003e\r\n\u003ch3\u003eWhy Sprindex?\u003c\/h3\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eTool-Free Adjustability:\u003c\/strong\u003e Twist the dial to change the number of active coils, altering your spring rate on the fly. The currently selected rate is displayed clearly through a window in the dial.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eProgressive Support:\u003c\/strong\u003e Engineered with a linear feel from 0-80% stroke for unmatched small-bump sensitivity and traction, transitioning to a progressive rate for the final 20% of stroke to provide big-hit bottom-out support.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eWeight \u0026amp; Performance:\u003c\/strong\u003e Lighter than ordinary fixed-rate coils, giving you the plush, stiction-free performance of a coil shock with the tuning flexibility you need.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eLow-Friction Adapters:\u003c\/strong\u003e Includes 5 Delrin performance adapters that improve shock fitment, eliminate binding, allow the spring to twist naturally during deflection, and prevent the preload ring from self-adjusting due to coil windup. *(Note: RockShox shocks do not require an adapter, though the performance washer is recommended).*\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sprindex\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Adjustable Coil Shock Spring\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eModel Range:\u003c\/strong\u003e Trail \/ Enduro (490 - 560 lbs)\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eStroke:\u003c\/strong\u003e 65 mm\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eLength (Without Adapters):\u003c\/strong\u003e 140 mm\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 464 grams\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eMaterials:\u003c\/strong\u003e Super High Tensile Spring Steel (Coil) \/ Glass-Reinforced Polymer (Assembly) \/ Delrin (Adapters)\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eIncluded Extras:\u003c\/strong\u003e 5x Performance Adapters for broad shock brand compatibility\u003c\/li\u003e\r\n\u003c\/ul\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748553363504,"sku":"SD40500-RP","price":269.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/Shock_Spring_Sprindex_Trail_Enduro_Model_Range_500-550_lbs_598ba81f-aa6a-4667-a3a8-db923f079a3b.jpg?v=1791294429"},{"product_id":"sprindex-shock-spring-sprindex-trail-enduro-540-610-lbs-2","title":"Shock Spring Sprindex Trail \/ Enduro 540-610 lbs","description":"\u003cp\u003eSPRINDEX ALLOWS FOR TOOL-FREE, EASY ADJUSTMENT OF YOUR COIL'S SPRING RATE. Adjusting your shock's spring rate can profoundly improve your bike's handling and suspension. In fact, you may find yourself using different spring rates for different trails, depending on the conditions and type of trail. Or you may increase your spring rate for long climbs and decrease it for down hills. No expense was spared on the materials or manufacturing processed used. The coil itself is made of super high tensile spring steel similar to \"lightweight\" springs (which is why Sprindex is lighter than regular springs) in order to handle the stress of the system when adjusted to its highest spring rate setting, as well as reduce coil mass. The Sprindex assembly is made of glass reinforced polymer. The 5 included adapters are made of slippery Delrin. Spring rate is the force required to move a spring a given distance and independent of preload. For example, a \"400 lb\/in\" spring requires 400 pounds to move the spring 1 inch and 800 pounds to move a spring 2 inches. Preload is how much force is required to start moving the spring. Sprindex is patent pending in many countries. Follow your shock manufacturer's instructions for preload amount and sag and other shock adjustments. Do not preload your Sprindex more than 3 turns and 1 to 2 turns is preferred. Your Sprindex coil behaves like a regular coil that has a spring rate the same as your adjusted Sprindex spring rate. Adjusting your Sprindex does not change the length of the coil and so does not change your preload. Preload is adjusted normally and with the threaded ring that came with your shock. HOW DOES SPRINDEX ADJUST SPRING RATE? The spring rate of a spring is the amount of force it takes to deflect the spring a certain distance (typically pounds per inch or Newtons per mm). Spring rate is a function of 4 characteristics: wire diameter, coil diameter, material, and number of active coils. More active coils causes a lower spring rate and fewer active coils causes a higher spring rate. Think of it like this: the less wire there is to bend, the stiffer the spring. By twisting the Dial, Sprindex works by altering the number of active coils available for deflection. The adjusted spring rate is displayed through a window in the Dial. COIL SHOCKS VERSUS AIR SHOCKS Most agree that coil shocks outperform air shocks, assuming the right spring rate for the particular rider. Air shocks have significant \"stiction\" which is friction that resists the shock's initial movement. Coil shocks have much less stiction. Coil shocks soak up small bumps much better, better tire contact with the ground, give better traction, better ride quality, and make a rider measurably faster. So why are air shocks more common? The answer is lack of adjustability for coils and weight. Traditional coils have a fixed spring rate and spring rate has a dramatic effect on riding performance and feel. Most people ride the wrong spring rate because springs are typically only available in wide increments. Spring rate has a profound effect on bike performance. Coil shocks also weigh more than air shocks, but when using the right spring rate, the small weight penalty is easily worth it. Besides, Sprindex is lighter than ordinary shock springs. SPRING RATE IS DIFFERENT FROM PRELOAD Coil shocks include a threaded ring for preloading the coil. However, preloading is not the same as using a stiffer (higher spring rate) spring. Sprindex Preload A sprindex coil behaves exactly like a regular coil of the selected spring rate. For example, Sprindex adjusted to 435 lb\/in behaves just like a custom made 435 lb\/in standard coil. Poor small bump absorption resulting in a harsh ride and poor traction because it increases force to start coil movement. Either reduces shock travel and\/or over-stresses spring. Improper SAG. SAG must be achieved by spring rate, not preload. Doesn't change coil spring rate. If you bottom out with a spring, heavy preloading may not solve this and will mess up the rest of the stroke. Mountain bike shocks are designed for as little preload as is necessary to take play out of the system. Any more preload than this harms ride performance. SPRINDEX IS PROGRESSIVE Besides having an adjustable spring rate, Sprindex is also progressive. Sprindex is specifically designed to have a progressive spring rate for the last 20% of stroke for big hit support and for bikes with a linear linkage design. Coil versus Air: A coil is usually very linear, whereas an air shock starts out Regressive (a reducing spring rate), and then turns progressive (an increasing spring rate). See the chart below. One of the disadvantages to using an Air shock is that its regressiveness mean less small bump sensitivity and traction. This is partly why Air shocks are not as plush as Coil. Regardless of your bike's suspension design, Sprindex being linear between about 0-80% stroke and progressive between about 80% and 100% stroke works great because it provides unbeatable sensitivity and traction through all the small and medium movement and it provides progressive support for big hits. Most importantly, Sprindex also provides spring rate adjustment in order to fine tune the perfect spring rate so that you maximize your suspension performance. Performance Adapters Performance Adapters are included. Sprindex coils fit a wide variety of shocks, but you must use the Performance Adapters for most of them. Our Performance Adapters both improve the fit between the coil and your shock and are made of low friction Delrin to improve shock performance by allowing the spring to twist during high deflection. Also, the Performance Adapters help prevent the preload ring from self-adjusting due to coil windup. See bottom of Performance Adapter for instruction of which Performance Adapter you should use. For Rockshox, no Performance Adapter is required but we recommend you use the Performance Washer adapter for shock performance and to help prevent preload self-adjustment.\u003c\/p\u003e","brand":"Sprindex","offers":[{"title":"Default Title","offer_id":50748553494576,"sku":"SD40550-RP","price":269.0,"currency_code":"NZD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/Shock_Spring_Sprindex_Trail_Enduro_Model_Range_540-610_lbs_725369c3-d68f-4751-b77d-b4188c75b670.jpg?v=1791294430"}],"url":"https:\/\/www.moto1.nz\/collections\/sprindex.oembed","provider":"Moto1","version":"1.0","type":"link"}