Ethirteen
Product Description
e*thirteen Helix Core e*spec Cranks for ISIS Spindle Motor Systems - 160mm, 21.5mm Offset, Black
The e*thirteen Helix Core e*spec Cranks deliver an exceptional e-bike drivetrain upgrade, combining high-end structural integrity and refined aesthetics at an extreme value. Engineered to withstand the relentless torque and punishing loads of modern e-MTB riding, these cranks ensure you never have to hold back on your next gravity run. By blending a value-conscious production layout with robust construction, e*thirteen provides privateers and daily trail riders with a reliable alternative to premium-priced models without sacrificing trail confidence.
This model is engineered for standard 24mm ISIS spindle motor interfaces, offering seamless compatibility with the market's leading e-bike platforms—specifically optimizing layouts for the Bosch SX, TQ HPR50, Brose S Mag, DJI Avinox, Yamaha, and Specialized 2.2/3.1 motor systems. Featuring a narrow 21.5mm offset, these cranks help maintain a highly efficient and compact stance width. Depending on your motor configuration, this offset achieves tight, tailored Q-factors: a precise 169.6mm on TQ platforms, 172.7mm on Bosch systems, and 186mm on Brose setups, striking an excellent balance between structural motor casing clearance and ergonomic pedaling alignment.
At an optimized, short 160mm length, these crank arms strike the ideal sweet spot between raw pedaling leverage and vital ground clearance on modern, low bottom-bracket frame geometries. Shorter crank lengths allow riders to maintain a fast, fluid pedaling cadence through rocky, root-strewn climbs, significantly improving technical climbing capability while minimizing the risk of high-speed pedal strikes. For ease of maintenance, the arms feature an integrated alloy self-extracting crank bolt system that makes routine home workshop servicing and installation quick, simple, and efficient.
Weighing 509g, these stealthy black crank arms are forged from high-strength AL 6066-T6 aluminum to ensure maximum durability against heavy rock strikes and accidental casing. e*thirteen packs this economic upgrade with premium attention to detail, including durable steel pedal washers to protect the spindle threads from high-load deformation and custom-molded composite crank boots that act as a resilient shield against trail debris. Fully engineered for aggressive trail duty, the Helix Core e*spec cranks are backed by e*thirteen's dependable 5-year manufacturer warranty.
Key Features
- Forged AL 6066-T6 Aluminum Construction: Delivers high-end durability, structural stiffness, and dependable trail strength at an accessible price point
- Optimized Short 160mm Length: Increases vital ground clearance on low-BB frame designs to eliminate pedal strikes while maintaining natural leverage and pedaling fluidics
- Narrow 21.5mm Offset Profile: Yields an ergonomic, tighter stance with optimized Q-factors across compatible ISIS motor casings
- Standard 24mm ISIS Compatibility: Designed for flawless integration with Bosch SX, TQ HPR50, Brose S Mag, DJI Avinox, Yamaha, and Specialized systems
- Integrated Alloy Self-Extractor: Heavy-duty self-extracting bolt configuration makes installation and routine drivetrain maintenance efficient and tool-free
- High-End Hardware Inclusions: Comes equipped with durable steel pedal washers and high-impact molded protective crank boots for maximum longevity
Specifications
- Model: e*thirteen Helix Core e*spec Cranks
- Crank Arm Length: 160mm
- Spindle Interface Type: 24mm ISIS Spindle
- Crank Offset: 21.5mm
- Realized Q-Factors: TQ: 169.6mm | Bosch: 172.7mm | Brose: 186mm
- Motor System Compatibility: Bosch SX, TQ HPR50, Brose S Mag, DJI Avinox, Yamaha, Specialized (2.2/3.1)
- Material: Forged AL 6066-T6 Aluminum
- Pedal Thread Interface: Includes Steel Pedal Washers
- Extraction Mechanism: Integrated Alloy Self-Extractor System
- Protective Hardware: Molded Composite Crank Boots Included
- Weight: 509g
- Color: Black
- Warranty: 5 Years
A durable, value-optimized alloy e-bike crank arm upgrade combining a rock-clearing 160mm profile with a compact 21.5mm offset, built for trail riders who demand high-end e-MTB strength and reliability without the premium price tag.
Shipping Policy
We pay shipping on orders over $150 to Nationwide addresses, excluding Rural addresses and some Bulky items.
Orders under $150 cost $7.99
Rural order fee $4.99
Aerosol and Dangerous Goods fee $9.99
For a specific delivery ETA based on the exact item(s) you want to purchase, please call us at 0800 793 593 or message us via Chat before placing an order.
We understand that when you make an order, you want your parts as quickly as possible and we will do our best to make that happen! Most of the items we sell will ship quickly and be at your door fast. If urgent freight is required, we work closely with our vendors in order to have the product shipped directly to you from their warehouse if that means you will get the product faster.
Items will have an availability status shown once a size/color is selected on the product page; this availability status will also be shown on the shopping cart page and in your order confirmation email. Most products will be marked "In Stock". These products will ship within 1-2 business days.
While we will do our best to ship from the distribution center closest to you, not all items will always be in stock in every location at all times. In some cases we will split the order and ship each package out to you individually and in other cases we may need to consolidate the items in one location to ship out as one package. We utilize our best judgment in an attempt to get the products to you as quickly as possible.
A shipping confirmation email including courier specific tracking information will be sent the same day as the item ships.
RETURNS POLICY
Returns
Our policy lasts 90 days. If 90 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange.
To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.
Several types of goods are exempt from being returned. Perishable goods such as food, flowers, newspapers or magazines cannot be returned. We also do not accept products that are intimate or sanitary goods, hazardous materials, or flammable liquids or gases.
Additional non-returnable items:
- Gift cards
- Downloadable software products
- Some health and personal care items
To complete your return, we require a receipt or proof of purchase.
Please do not send your purchase back to the manufacturer.
There are certain situations where only partial refunds are granted (if applicable)
- Any item not in its original condition, is damaged or missing parts for reasons not due to our error
- Any item that is returned more than 90 days after delivery
Refunds (if applicable)
Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.
Late or missing refunds (if applicable)
If you haven’t received a refund yet, first check your bank account again.
Then contact your credit card company, it may take some time before your refund is officially posted.
Next contact your bank. There is often some processing time before a refund is posted.
If you’ve done all of this and you still have not received your refund yet, please contact us at sales@moto1.nz.
Sale items (if applicable)
Only regular priced items may be refunded, unfortunately sale items cannot be refunded.
Exchanges (if applicable)
We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at sales@moto1.nz
Gifts
If the item was marked as a gift when purchased and shipped directly to you, you’ll receive a gift credit for the value of your return. Once the returned item is received, a gift certificate will be mailed to you.
If the item wasn’t marked as a gift when purchased, or the gift giver had the order shipped to themselves to give to you later, we will send a refund to the gift giver and he will find out about your return.
Shipping
To return your product, please email us to receive instructions.
You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.
Depending on where you live, the time it may take for your exchanged product to reach you, may vary.
If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.
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