- In stock, ready to ship
- Free shipping on all orders $59+
E*thirteen’s Helix Race Crank Arms combine lightweight design, impressive strength, and striking aesthetics. Engineered with XC-level weight and Enduro-worthy durability, these top-tier cranks feature forged AL6066-T6 arms crafted to maximize stiffness and strength while minimizing excess material. Extensive CNC optimization enhances the technical appearance and weight savings, while a 30mm forged AL7050-T7 spindle adds rigidity and reduces overall weight.
The Helix Race Crankset offers versatile compatibility with Boost and SuperBoost chainlines through its flip-flop Helix Race Chainrings, available in a full range of vibrant Helix colors to match with e*thirteen cassettes and components. The Quick Connect interface ensures a creak-free, secure fit, and Helix rings are fully compatible with Shimano and Sram 11 and 12-speed drivetrains, future-proofing your setup. The cranks also feature the latest APS preload adjuster system and custom crank boots to keep them looking new.
E*thirteen Helix R Crank Arm Features
- Spindle is on the non-drive side of the crank for easier chain guide setup and drivetrain maintenance
- Adjustable chainline accommodates non-Boost (142mm), Boost (148mm) and Super Boost (157mm)
- Now includes an 8mm self-extractor, meaning the cranks can be removed with nothing more than an 8mm allen key
- Lightweight aluminum trail crank arms and aluminum spindle w/ Quick Connect lockring and Adaptive Preload Adjuster (APS), compatible with all Quick Connect Guiderings
- Crank arm and chainring/BB removal tool included
E*thirteen Helix R Crank Arm Specs
| Chainline: | 52mm, 55mm |
| Length: | 160mm, 165mm, 170mm, 175mm |
| Material: | CNC Machined AL-6066-T6 arms, 30mm AL 7050-T7 spindle |
| Spindle Size: | 68/73mm width, 30mm diameter, Interface P3 Connect |
| Weight: | 547g (160mm), 556g (165mm), 566g (170mm), 574g (175mm) |
| Includes: | Crankset, APS Adjuster, BB/Lockring tool, crank boots |
E*thirteen Helix R Crank Arm Compatibility
- Chainring: Helix R, Plus, and Steel chainrings to achieve a 52mm or 55mm chainline
- Chain: SRAM and Shimano 12-speed, Narrow/Wide
- Bottom Bracket: BSA 68/73mm, BB30, BB92 and PF30
Please reach out to us with any questions you may have on anything we sell. We want to make sure you get the right items the first time. Our lifelong riders at Thunder Mountain Bikes are knowledgeable and would love to talk to you!
Shipping
We currently offer both economy and expedited shipping options though FedEX and USPS.
Orders totaling over $59 are eligible to ship for free via an economy ground option of our choice.
Most bikes ship free within the continental US. Bike shipping to AK, HI, or PR is $250.
If you're in need of something super-quick, please contact us directly. We may be able to overnight your order with an additional fee and depending on your location.
RETURNS
Should there be an issue with the item you bought, or you no longer need your purchase, we will be happy to set up a return.
Component & Gear Returns
Returns may be requested within sixty (60) days of the delivery date. All returned items must be received in new, unused, and uninstalled condition, with the original tags and labels attached and in the original packaging. We cannot accept returns on any items installed or show wear of any kind.
Bike Returns
Returns or exchange requests for bikes must be requested by emailing us at sedona@thundermountainbikes.com within fifteen (15) days from the date of delivery. Bikes must be in un-ridden condition. Custom-built bikes may not be returned. Returned bikes have a $200 restocking fee and the customer pays for return shipping.
Return Shipping
Customers may choose to use our provided flat-rate return shipping label at $9, or choose a carrier of their choice to handle their product return.
The $9 flat rate label will be deducted from the refund issued for the return. You can either print this label after requesting a return from the Order History in your Account profile, or you can request that we email you the label.
For all other return shipping methods, please email us at sedona@thundermountainbikes.com after submitting your return request so that we can confirm the shipping information you should use to return your item(s).
REFUNDS
We will process your return after we receive your returned item(s) and inspect the condition. Please allow at least seven (7) days from the receipt of your item to process your refund. We will notify you by email when your return has been processed.
EXCEPTIONS
If you receive defective or damaged products or if we sent you the wrong products, please contact us using the phone number or email below.
RETURN PROCESS
To request a return, please log in to your customer account by clicking the 
Profile icon in the top right of any page or visit account.thundermountainbikes.com.
1. In the Email field, enter your email address and click Continue.
2. In your email account, open the email sent from our store and copy the six-digit verification code included in the email.
3. Go back to the online store and enter a six-digit verification code to log in.
4. Find and click on the order that you want to submit a return for.
5. If your order has more than one item, select only the items you want to return.
6. Select a return reason and add a note for the store if needed.
7. Click Request Return.
Once your return request is approved, you will receive an email with shipping instructions and a return shipping label.
QUESTIONS ABOUT RETURNS?
If you have any questions concerning our return policy, please contact us at:
