SRAM GX Eagle lineups have long been the go-to drivetrain for dedicated and budget-minded riders, and it's now available within the new Transmission family! This system retains its unwavering commitment to performance and affordability while incorporating modern upgrades for the next generation of bikes.
The GX Eagle Transmission derailleur offers the same exceptional precision and responsiveness as other derailleurs in the Transmission lineup, with the added benefits of removable skid plates for enhanced protection and easier maintenance.
Thanks to the innovative combination of X-SYNC technology and cassette mapping, the GX cassette enables seamless shifting, especially under heavy load, ensuring smooth gear transitions during the most intense power outputs.
The GX Eagle Transmission (T-Type) chain is SRAM's toughest chain yet. Meticulously engineered to optimize the Eagle Transmission system, this brand-new T-Type design boasts a unique flat top and solid pins, delivering unparalleled strength and durability to handle the increased torque loads of E-MTBs.
This upgrade kit provides all the components needed to elevate your drivetrain to the latest technology, while still allowing you to use your existing cranks or choose an aftermarket option.
Note: A compatible T-Type chainring is required. Battery and charger are included!
GX Eagle Transmission AXS Upgrade Kit Specs:
Derailleur
| Model: | GX Eagle Transmission |
| Model ID: | RD-GX-E-B1 |
| Shift Technology: | Wireless |
| Communication Protocol: | AXS |
| Max Tooth: | 52t |
| Cage Material: | Steel |
| Drive Config: | 1x |
| Chain Technology: | T-Type |
| Weight: | 470 Grams |
Controller
| Model: | AXS Pod |
| Model ID: | EC-AXS-POD-D1 |
| Controller Type: | Wireless |
| Orientation: | Left, Right |
| Clamp: | Discrete, MMX |
XD Cassette
| Model: | XS-1275 |
| Model ID: | CS-XS-1275-A1 |
| Freehub Interface: | SRAM XD |
| Gearing: | 10-52t |
| Cog Finish: | Black, Silver |
| Technology: | XS |
| Cog Sizes: | 10-52t:10,12,14,16,18,21,24,28,32,38,44,52 |
| Weight: | 445 grams |
HG Cassette
| Model: | XS-1270 |
| Model ID: | CS-XS-1270-A1 |
| Freehub Interface: | Shimano HG |
| Gearing: | 10-52t |
| Cog Finish: | Black, Silver |
| Technology: | XS |
| Cog Sizes: | 10-52t:10,12,14,16,18,21,24,28,32,38,44,52 |
| Weight: | 565 grams |
Chain
| Model: | GX Eagle Transmission Flattop |
| Model ID: | CN-TTYP-GX-A1 |
| Outer Link Finish: | Nickel |
| Outer Link Color: | Silver |
| Inner Link Finish: | Chrome Hardened |
| Inner Link Color: | Silver |
| Chain Connector: | PowerLock 12s T-Type |
| Chain Length: | 126 links |
| Pin Variant: | Solid Pin |
| Weight: | 285 grams |
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 through FedEX and USPS.
Most orders totaling over $59 are eligible to ship for free via an economy ground option of our choice.
Due to larger box sizes, handlebars and other oversized items will have an additional shipping fee.
Most bikes ship free within the continental US. Bike shipping to AK, HI, or PR is available at an additional charge depending on the exact delivery location.
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 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 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:
