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 DUB crankset sets itself apart, providing uncompromising functionality and a sleek design. Crafted from lightweight aluminum, it strikes a perfect balance between strength and weight reduction.
Additionally, the optional composite removable bashguards serve a practical purpose and safeguard against scratches and dings that commonly occur during gnarly rides.
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.
GX Groupset includes:
GX Eagle Crankset
| Model: | FC-GX-D1 |
| Crank Arm Length: | 165mm, 170mm, 175mm |
| BB Spindle Interface: | DUB |
| BB Compatibility: | All SRAM MTB Wide DUB BBs |
| Speeds: | 12s T-Type |
| Chainring Material: | Aluminum |
| Bolt Circle Diameter: | Direct Mount (DM) |
| Chainline: | 55.0mm |
| Chainring Size: | 32T |
| Weight: | 740 grams (based on 170mm/32T/2G/DUB wide) |
SRAM Eagle Transmission features a SRAM MTB WIDE crank with a 55mm chain line while using the Boost 148mm Over-Locknut Dimension hub standard. Eagle Transmission cassettes move outboard by 2.5mm to optimize for this wider, 55mm chain line. For bikes with SuperBoost 157mm hubs, a 55mm chain line crank can be used. For bikes with a 142mm hub spacing, a 52mm crank must be used.
GX Eagle AXS Rear Derailleur
| Model: | RD-GX-E-B1 |
| Speed: | 12s T-Type |
| Color: | Dark Polar |
| Cage Material: | Steel |
| Max Tooth: | 52 |
| Weight: | 470 grams (without Battery) |
GX Eagle XS-1275 Cassette
| Model: | CS-XS-1275-A1 |
| Speed: | 12s T-Type |
| Gearing: | 10-52t |
| Cog Finish: | Silver |
| Technology: | XS |
| Cog Sizes: | 10-52t:10,12,14,16,18,21,24,28,32,38,44,52 |
| Weight: | 445 grams (based on Engineering estimate) |
Eagle POD Controller
| Model: | EC-AXS-POD-B1 |
| Shifter Type: | Electronic |
| Clamp: | N/A |
| Weight: | 48 grams |
GX Eagle Flattop Chain
| Model: | 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: | 108 links, 110 links, 112 links, 114 links, 116 links, 118 links, 120 links, 122 links, 124 links, 126 links |
| Pin Variant: | Solid Pin |
| Weight: | 285 grams (based on 126 LINK, PowerLock) |
AXS Battery and Charger
DUB Wide bottom bracket not included.
SRAM Eagle Transmission AXS Compatibility:
The SRAM GX Eagle Transmission AXS Groupset is compatible with the following:
| Frameset: | Any frame that fulfills the “UDH Specification” featuring a hanger-less interface can be upgraded. The SRAM UDH Bike Finder lists all UDH bikes that are compatible with Eagle Transmission. |
| Battery: | SRAM AXS Battery |
| Bottom Bracket: | SRAM DUB "Wide": BSA73, PF89.5, PF92, PF30 MTB73, BB30 MTB73, BSA MTB68SP |
| Chain: | XX SL, XX, X0 or GX Eagle Transmission chains |
| Chainring: | XX SL, XX, X0 or GX Eagle Transmission chainring |
| Cassette: | XX SL, XX, X0 or GX Eagle Transmission cassette |
| Controller: | AXS POD Controller, AXS Pod Ultimate Controller |
| Crankset: | XX SL, XX, X0 or GX Eagle Transmission cranksets |
| Freehub: | SRAM XD compatible freehubs |
| PowerLock: | Eagle Transmission PowerLocks only |
| Rear Derailleur: | XX SL, XX, X0 or GX Eagle Transmission rear derailleur |
SRAM Eagle Transmission is not compatible with previous-generation Eagle components. However, Eagle Transmission T-Type chainrings are backward compatible with Eagle chains, so they can be used on the current Eagle drivetrains. Non-T-Type Eagle chainrings will not work with Eagle Transmission chains.
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:
