Ethirteen
Product Description
e*thirteen Helix Race Alloy e*spec Cranks for ISIS Spindle Motor Systems - 165mm, 26mm Offset, Bronze
Upgrade your electric mountain bike with the stiff, lightweight, and beautifully engineered e*thirteen Helix Race Alloy e*spec Cranks. Forged and precision CNC-sculpted from premium 6066-T6 aluminum, these high-performance crank arms offer an incredibly robust, impact-resistant alternative to carbon fiber without the weight penalty. Purpose-built to handle the demanding, high-torque output of aggressive e-MTB riding, they feature a low overall profile and pair seamlessly with Helix Race e*spec Direct Mount chainrings to deliver the ultimate combination of premium trail performance and clean, factory integration.
This model is engineered for standard ISIS spindle motor interfaces, providing extensive compatibility across the industry's leading e-bike platforms, including Bosch CX Gen 4/Gen 5, Bosch SX, TQ HPR50, Brose S Mag, DJI Avinox, Yamaha, and Specialized Turbo Levo/SL motor systems. Featuring a 26.5mm offset, these cranks achieve an optimized 182.9mm Q-factor. This precise geometry balances internal motor casing clearance with a natural, ergonomic stance width that optimizes pedaling efficiency and maximizes control when navigating technical trail features.
At a highly versatile 165mm length, these crank arms provide the ideal sweet spot for modern e-MTB geometries. They offer a more traditional, high-leverage power transfer feel that many riders prefer for out-of-the-saddle efforts, while still delivering improved ground clearance compared to standard 170mm or 175mm cranks. This helps minimize pedal strikes on technical, rocky climbs without forcing a dramatic change in your riding style or cadence. The assembly is built to last with premium 7075 alloy hardware, integrated alloy self-extractors for effortless tool-free extraction, and an e*thirteen Adaptive Preload System (APS) adjuster for simple, play-free bearing setup.
Weighing 433g, these eye-catching bronze anodized crank arms are engineered to take a beating. The full CNC finish strips away unnecessary material to maximize the strength-to-weight ratio, while the included custom-molded protective crank boots act as a resilient shield against inevitable rock strikes and trail debris. Fully engineered for continuous, high-performance trail abuse, the Helix Race Alloy e*spec cranks are backed by e*thirteen's dependable 5-year manufacturer warranty.
Key Features
- Forged & CNC-Machined 6066-T6 Alloy: Sculpted structural design delivers maximum impact resistance and stiffness, serving as an elite alternative to carbon fiber
- Versatile 165mm Length: Delivers exceptional pedaling leverage and torque control while improving ground clearance over standard lengths to reduce pedal strikes
- Standard ISIS Spindle Interface: Broadly compatible with Bosch CX Gen 4/5, Bosch SX, TQ HPR50, Brose S Mag, DJI Avinox, Yamaha, and Specialized systems
- Optimized 26.5mm Offset: Delivers a balanced 182.9mm Q-factor to ensure clear motor integration and a natural, ergonomic pedaling stance
- Premium Pro-Level Hardware: Outfitted with 7075 alloy hardware, an integrated self-extractor mechanism, and an APS bearing preload adjuster
- Premium Bronze Anodized Finish: Provides long-lasting resistance against trail abrasions while giving your motor setup a distinct visual identity
- Huckproof Crank Boots Included: Includes custom-molded, high-impact composite protective boots to guard crank ends against rock-strike damage
Specifications
- Model: e*thirteen Helix Race Alloy e*spec Cranks
- Crank Arm Length: 165mm
- Spindle Interface Type: ISIS Spindle
- Crank Offset: 26.5mm
- Realized Q-Factor: 182.9mm
- Motor System Compatibility: Bosch (CX Gen4/5, SX), TQ (HPR50), Brose (S Mag), DJI (Avinox), Yamaha, Specialized (2.2/3.1)
- Material: Forged and CNC-Machined AL-6066-T6 Aluminum
- Hardware Material: 7075 Aluminum
- Extraction Mechanism: Integrated Alloy Self-Extractor
- Adjustment System: e*thirteen APS (Adaptive Preload System) Adjuster
- Weight: 433g
- Color: Bronze
- Warranty: 5 Years
A premium, high-stiffness alloy crank arm upgrade combining a balanced 165mm trail length with elite ISIS spindle motor compatibility, built for aggressive e-MTB riders who demand ultimate durability and unique custom style.
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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