R-SPEC Trail Enduro Cranks
R-SPEC Trail Enduro Cranks

R-SPEC Trail Enduro Cranks

SKU: R135-29-02

Regular price Sale price$349.99
Crank Arm Length
  • Low stock - 1 item left
  • Inventory on the way
  • Free shipping on all orders $49+

These meticulously crafted cranks come with a lineup of impressive details, including Q factor options for both Boost and SuperBoost, compatibility with various bottom bracket widths, and your choice of spindle diameters. You can also select the ideal length for your riding style, ranging from 155mm to 170mm. Crafted from high-quality 7050 Billet Aluminum and featuring robust Chromoly Steel crank bolts, these cranks are built to endure. With self-extracting hardware and a CNC'd 7075 Alloy preloader, they offer both convenience and precision. The 5DEV R-SPEC cranks seamlessly accommodate SRAM 3-Bolt Direct Mount Chainring Interfaces. They're optimized for performance without unnecessary bulk at a lightweight 610g (for the 165mm length with a 29mm spindle). Rest assured with a 5-year warranty, and discover the ultimate in crank innovation, proudly made in San Diego, California.


Q Factor: 167mm Boost | 176 SuperBoost+
Bottom Bracket Width: 68 - 73mm for Boost | SuperBoost Available in Select Sizes
Spindle Diameter: 30mm and 29mm (Need help determining what spindle size? CLICK HERE)
Lengths: 155mm, 160mm, 165mm, 170mm
Material: 7050 Billet Aluminum
Crank Bolts: Chromoly Steel
Hardware: Self-extracting Hardware
Preloader: CNC'd 7075 Alloy
Chainring: Compatible with SRAM 3-Bolt Direct Mount Chainring Interface
Weight: 610g (165mm length 29mm spindle)
Warranty: 5 Years


5DEV Offers Standard Boost Cranks 68/73mm BB with 2 Spindle Sizes and SuperBoost+ Spindles for select crank lengths.

  • SRAM DUB 29mm (28.99mm) If you have SRAM Cranks on your bike, you need the 29mm spindle option.
  • 30mm Spindle for 30mm Bottom Brackets. 30mm is a standard bearing size, and most aftermarket BB’s use this size. CaneCreek, Chris King, EuroBearing, Kogel etc. If you have an aftermarket BB. It’s probably 30mm.
  • Shimano: If you have Shimano Cranks, you have a 24mm BB from Shimano. You must determine if your BB is a Press Fit or a BSA Style (Threaded). Then you will need to replace your BB with either a SRAM DUB or an Aftermarket Brand with 30mm Bearings.
  • If you have SuperBoost+ the same applies. Determine if you have SRAM or 30mm BB.

Please reach out to us with any questions you may have on anything we sell. We want to make sure you get the right part the first time. Our lifelong riders at Thunder Mountain Bikes are knowledgeable and would love to talk to you!


We currently offer both economy and expedited shipping options though FedEX and USPS. 

Orders totaling over $49 are eligible to ship for free via an economy ground option of our choice. 

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. 


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.

Returns or exchange requests for New or Used 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.

Returns for most other items 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. 

Clearance and open-box items may not be returned. 


To request a return, please log in to your customer account by clicking the  customer account icon  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. 


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.


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.


If you have any questions concerning our return policy, please contact us at:

(928) 282-1106   |   sedona@thundermountainbikes.com

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Customer Reviews

Be the first to write a review