Bring your trail bike into the future with the Shimano Deore XT Di2 M8250 Complete Upgrade Kit. This all-in-one bundle delivers ultra-fast wireless shifting, trail-proven durability, and Shimano’s latest drivetrain tech for serious riders who demand peak performance. At the heart is the M8250 Di2 rear derailleur—lighter, stronger, and smarter, engineered with 23mm of extra ground clearance and automatic impact recovery to keep your ride smooth and snag-free.
Paired with the RAPID ES shifter, this setup offers intuitive control with customizable button functions and precise shift actuation. Power comes from the integrated BT-DN320 battery, which tucks safely inside the derailleur and charges easily with the compact EC-EN100 charger. The kit is rounded out with the wide-range CS-M8200 cassette and smooth-shifting CN-M8100 chain, delivering a full 12-speed wireless drivetrain built for real-world trails.
Shimano XT Di2 M8200 derailleur and shifter are 100% backwards compatible with your current Shimano 12-Speed cassette, crankset/chainring, and chain.
What's Included:
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RD-M8250-GS Di2 Rear Derailleur
Rugged, mid-cage derailleur with wireless shifting, impact recovery, and 500% gear range. -
SW-M8250-R/IR Di2 Shifter Switch
Customizable wireless shifter with ergonomic paddles and programmable multi-shift modes. -
BT-DN320 Di2 Battery
Compact, removable battery powers your Di2 drivetrain for up to 340 km per charge. -
EC-EN100 Di2 Charger
Slim, easy-to-use charger designed specifically for the Di2 battery. -
CS-M8200 10–51T Cassette
Wide-range 12-speed cassette with HYPERGLIDE+ for smooth, fast shifting under load. -
CN-M8100 12-Speed Chain
Durable SIL-TEC chain with enhanced retention and quick-link installation.
Why Choose the XT Di2 M8200 Complete Upgrade Kit?
This complete wireless drivetrain upgrade brings cutting-edge shifting technology and race-ready efficiency to the trail. With seamless customization via Shimano’s E-Tube app, precise shift mapping, and rugged component construction, the XT M8200 kit is built to go faster, shift smarter, and ride harder.
XT Di2 M8200 Complete Upgrade Kit Specs:
Derailleur
| Model: | XT M8250 |
| Model ID: | RD-M8250-GS (Mid Cage) RD-M8250-SGS (Long Cage) |
| Shift Technology: | Wireless |
| Communication Protocol: | Di2 |
| Max Tooth: | 38t |
| Drive Config: | 1x |
| Weight: | TBD |
Cassette
| Model: | XT M8200 |
| Model ID: | CS-M8200-12 |
| Gearing: | 9-45t, 10-51t |
| Technology: | HYPERGLIDE+ |
| Cog Sizes: | 9-45t: 9-11-13-15-17-19-21-24-28-33-39-45t 10-51t: 10-12-14-16-18-21-24-28-33-39-45-51t |
| Installation Note: | 45t Requires the Shimano TL-LR21 Cassette Tool for installation. |
Shifter
| Model: | XT M8250 |
| Model ID: | SW-M8250-R/IR |
| Shifter Type: | Wireless |
| Orientation: | Right |
| Clamp: | 22.2mm Band Clamp |
Chain
| Model: | XT M8100 |
| Model ID: | CN-M8100 |
| Type: | HG |
| Rear Speeds: | 12 |
| Roller Link Plate: | Chromizing |
| Pins: | Hollow |
| # of links: | 126 |
| Weight: | 242g |
Compatibility
The Shimano XT Di2 M9800 Complete Upgrade Kit is 100% backwards compatible with your current Shimano 12-Speed cassette, crankset/chainring, and chain. Compatible models include: XTR M9100 and M9200, Deore XT M8100, SLX M7100, and Deore M6100.
Medium cage derailleurs are compatible with 45t cassettes. and long cage derailleurs are compatible with 51t cassettes.
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:
