Helix Race 12-Speed 9-52t Cassette
Helix Race 12-Speed 9-52t Cassette
Helix Race 12-Speed 9-52t Cassette
Helix Race 12-Speed 9-52t Cassette
Helix Race 12-Speed 9-52t Cassette

Helix Race 12-Speed 9-52t Cassette


Regular price Sale price$345.95
  • In stock, ready to ship
  • Inventory on the way
  • Free shipping on all orders $49+
The e*thriteen Helix Race 12-speed 9-52t cassette is engineered to deliver precision shifting performance with an industry leading 578% gear range. The proprietary 9 tooth smallest cog combined with the 52t largest cog enables the use of a smaller chainring for improved clearance lighter system weight and a lower bail out gear ratio without high gear compromise.
  • Seamless cross-compatibility with Shimano SRAM and TRP 12-speed drivetrains
  • Patented 2-Part design provides strength stiffness light weight and ease of service
  • Aluminum and steel clusters can be replaced separately to reduce service cost
  • 9 tooth high gear allows use of smaller chainrings for clearance and weight savings
  • Fits XD™ and XDR™ Drivers Only (Hope XD drivers are undersized at the clamp location and require a Cassette Shim Kit -Sold Separately)
  • Tested extensively for analog and e-bike use
  •  Details: 

    Cassette Body Type SRAM XD 11/12 Speed
    Cassette Cogs 9-11-13-15-17-20-23-27-31-36-43-52
    Designed for ebike Yes
    Drivetrain Speeds 12
    Weight 392g

    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

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    Customer Reviews

    Based on 1 review
    Robert S
    Cheap part

    Looks great
    Super bad performance,
    After installing it gears seem to be working great. Rode around the block a couple times to make sure it was OK. Works great for the first couple times riding on trails. After the fourth or fifth time on the trail. A lot of the teeth were bent mostly on the lower gears.
    But looks great when it’s not moving!

    When I get the time, I’m gonna put my old cassette back on!