Built to thrive in the toughest conditions, the Shimano XTR M9250 Di2 Rear Derailleur is the go-to choice for elite enduro racers and XC riders who demand reliability and low weight. Designed to pair perfectly with the compact 9-45T XTR cassette (Medium Cage) or the 10-51T XTR cassette (Long Cage), it delivers ultra-fast wireless shifting and enhanced impact protection, so you stay in control no matter how rough the trail gets.
With a rugged build, auto-recovery from impacts, and added ground clearance, it’s Shimano’s most advanced and survivable derailleur yet.
Features:
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Wireless Di2 Shifting: With HYPERGLIDE+ for instant, smooth gear changes
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Auto Impact Recovery: Resets the derailleur instantly after a hit
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SHADOW ES: Shimano’s pioneering chain-stabilizing technology for better chain retention and protection
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23mm More Ground Clearance: With the new wedge shape
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Durable Carbon Cage, Skid Plate & Reinforced Pulley: Give you a robust ride you can trust when the trails get rough
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Protected, Removable Battery: Stays secure on rough trails (Battery not included, but can be purchased separately here.)
XTR M9250 Rear Derailleur Specs:
Medium Cage
| Model: | XTR M9250 |
| Model ID: | RD-M9250-GS |
| Max Tooth: | 45t |
| Drive Config: | 1x |
| Mount Interface: | Derailleur Hanger |
| Shift Technology: | Wireless |
| Communication Protocol: | Di2 |
| Weight: | TBD |
Long Cage
| Model: | XTR M9250 |
| Model ID: | RD-M9250-SGS |
| Max Tooth: | 51t |
| Drive Config: | 1x |
| Mount Interface: | Derailleur Hanger |
| Shift Technology: | Wireless |
| Communication Protocol: | Di2 |
| Weight: | TBD |
Works With
The Shimano XTR M9250 Di2 Rear Derailleur is 100% backward compatible with previous generation Shimano 12-speed chains and cassettes. Compatible models include: XTR M9100, Deore XT M8100, SLX M7100, and Deore M6100.
The XTR M9250 Rear Derailleur is compatible with the following:
| Frame: | Modern framesets via a derailleur hanger, including the Universal Derailleur Hanger (UDH) |
| Cassette: | 9-45t, 10-45t (Medium Cage - GS) 10-51t (Long Cage - SGS) |
| Shifter: | XTR M9250 |
| Chain: | 12-speed HG: XTR M9100, Deore XT M8100, SLX M7100, Deore M6100 |
| Battery: | BT-DN320 |
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:
