{"product_id":"ethirteen-helix-race-espec-direct-mount-chainring-for-bosch-cx-sx-36t-13mm-offset-black-1","title":"ethirteen Helix Race espec Direct Mount Chainring for Bosch CX\/SX - 36T, 13mm Offset, Black","description":"\u003cp\u003e\u003cstrong\u003ee*thirteen Helix Race e*spec Direct Mount Chainring for Bosch CX\/SX - 36T, 13mm Offset, Black\u003c\/strong\u003e\u003c\/p\u003e\r\n\u003cp\u003eThe \u003cstrong\u003ee*thirteen Helix Race e*spec Direct Mount Chainring\u003c\/strong\u003e merges cutting-edge engineering with a refined technical aesthetic, delivering the ultimate drivetrain performance upgrade for modern electric mountain bikes (e-MTBs). Forged and precision CNC-machined from premium 7075-T6 aluminum, this one-piece direct mount chainring is purpose-built to handle the high-torque loads of aggressive e-bike riding. When paired with Helix Race Alloy e*spec crank arms, it creates a clean, fully integrated look that significantly enhances both the strength and style of your motor system assembly.\u003c\/p\u003e\r\n\u003cp\u003eThis Bosch-specific version features a \u003cstrong\u003e13mm offset\u003c\/strong\u003e, meticulously calculated to deliver precise, friction-free chainline optimization depending on your specific Bosch motor generation. For Bosch CX Gen 4 and lightweight Bosch SX motor systems, it yields an agile 53mm chainline. When mounted to the latest high-performance Bosch CX Gen 5 motors, it transitions perfectly to a wider 55mm chainline. This accurate offset prevents premature drivetrain wear, minimizes friction, and guarantees smooth shifting performance across the entire gear range of wide-ratio cassettes.\u003c\/p\u003e\r\n\u003cp\u003eDrivetrain security is managed by e*thirteen's updated \u003cstrong\u003eM4 narrow-wide tooth profile\u003c\/strong\u003e. This advanced long-wearing shape features enhanced tooth geometry that locks the chain securely in place over punishing, high-speed trail chatter, eliminating the absolute need for a heavy chain guide. Furthermore, the M4 profile offers comprehensive cross-compatibility with Shimano, SRAM, and TRP 11 and 12-speed drivetrains—including seamless operation on premium SRAM T-Type Transmission systems, allowing you to run your preferred shifter and cassette setup without compromise.\u003c\/p\u003e\r\n\u003cp\u003eWeighing \u003cstrong\u003e127g\u003c\/strong\u003e, this 36T chainring is the largest size in the lineup, making it ideal for aggressive trail riders and high-speed e-bike applications where maximizing top-end speed on fire roads and fast singletrack descents is a priority. The one-piece design balances weight-saving performance with structural stiffness to prevent flexing under hard, out-of-the-saddle efforts. Finished in a durable, stealthy black anodized coating that protects the alloy against rock-strike abrasions and elements, it delivers maximum wear life and long-term reliability. The Helix Race e*spec chainring is compatible with all matching Bosch direct mount motor systems and is backed by e*thirteen's dependable 5-year manufacturer warranty.\u003c\/p\u003e\r\n\u003ch3\u003eKey Features\u003c\/h3\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eForged \u0026amp; CNC-Machined 7075-T6 Aluminum:\u003c\/strong\u003e One-piece construction delivers maximum structural stiffness, high wear life, and premium impact resistance\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eM4 Narrow-Wide Profile:\u003c\/strong\u003e Advanced tooth geometry offers bulletproof chain retention across brutal trail chatter and eliminates chain drop\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eUniversal Drivetrain Compatibility:\u003c\/strong\u003e Engineered to run seamlessly with Shimano, SRAM, and TRP 11\/12-speed systems, including SRAM T-Type Transmission\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eBosch Direct Mount Integration:\u003c\/strong\u003e Designed specifically for clean integration with Bosch CX Gen 4, Bosch CX Gen 5, and Bosch SX motor splines\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eOptimized Drivetrain Chainline:\u003c\/strong\u003e 13mm offset achieves a 53mm chainline on CX Gen 4 \/ SX systems, and a 55mm chainline on CX Gen 5 platforms\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eMaximum Speed Output:\u003c\/strong\u003e High-gear 36T profile provides a significant top-end push for high-velocity trail segments and open forest tracks\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\u003eModel:\u003c\/strong\u003e e*thirteen Helix Race e*spec Direct Mount Chainring\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eTooth Count:\u003c\/strong\u003e 36T\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eMotor Compatibility:\u003c\/strong\u003e Bosch CX Gen 4, Bosch CX Gen 5, Bosch SX\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eOffset:\u003c\/strong\u003e 13mm\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eChainline Realization:\u003c\/strong\u003e CX Gen 4 \/ SX: 53mm | CX Gen 5: 55mm\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eDrivetrain Compatibility:\u003c\/strong\u003e Shimano \/ SRAM \/ TRP 11-Speed \u0026amp; 12-Speed (Including SRAM T-Type)\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eTooth Profile:\u003c\/strong\u003e M4 Narrow-Wide\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Forged and CNC-Machined AL-7075-T6 Aluminum\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 127g\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 5 Years\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\u003cp\u003eA premium, high-stiffness direct mount chainring built for aggressive e-MTB riders who demand zero chain drops, maximum high-speed efficiency, and long-term gear durability on high-torque Bosch motor systems.\u003c\/p\u003e","brand":"Ethirteen","offers":[{"title":"Default Title","offer_id":50748654354480,"sku":"CR5HRA-126","price":179.0,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0031\/4012\/4739\/files\/Chainring_Direct_Mount_36T_e_thirteen_Helix_Race_9a85bf90-203a-4f04-a68c-5df608ee5556.jpg?v=1791295142","url":"https:\/\/www.moto1.nz\/products\/ethirteen-helix-race-espec-direct-mount-chainring-for-bosch-cx-sx-36t-13mm-offset-black-1","provider":"Moto1","version":"1.0","type":"link"}