Designed to deliver uncompromising performance on aggressive terrain, the Deore XT Di2 M8200 Enduro Drivetrain Kit blends Shimano’s legendary durability with wireless precision shifting. Whether you’re climbing techy singletrack or bombing steep descents, this fully integrated system offers smooth power transfer, pinpoint gear changes, and bombproof construction across every component.
At the heart of the kit is the RD-M8250 wireless rear derailleur, featuring automatic impact recovery, extended ground clearance, and Shimano’s latest SHADOW ES chain stabilization. Paired with the SW-M8250 shifter, you get ergonomic comfort, customizable shift modes, and crisp actuation with every press.
The FC-M8200 crankset, forged with Shimano’s proven HOLLOWTECH II construction, delivers strength and stiffness optimized for enduro demands. Combine it with the SM-CR86 direct-mount chainring for max compatibility and confidence.
Powering the drivetrain is the compact BT-DN320 battery, safely tucked inside the derailleur, with up to 340 km of runtime per charge. The included EC-EN100 charger ensures recharging is quick and hassle-free.
Rounding out the system, the CS-M8200 cassette delivers a massive gear range with HYPERGLIDE+ shifting that’s lightning fast even under heavy load. The CN-M8100 chain keeps everything running smoothly with enhanced retention and SIL-TEC durability.
What's Included:
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RD-M8250 Di2 Rear Derailleur
Wireless 12-speed derailleur with automatic impact recovery—built for precise, durable shifting on rough trails. -
SW-M8250 Di2 Shifter
Customizable, ergonomic shifter with programmable shift modes and a tactile, responsive feel. -
FC-M8200 Crankset
Lightweight and rigid Hollowtech II crank arms optimized for enduro power and efficiency. -
CS-M8200 10–51T Cassette
Wide-range 12-speed cassette with smooth Hyperglide+ shifting under load. -
BT-DN320 Di2 Battery
Compact, integrated battery with up to 340km of ride time per charge. -
EC-EN100 Battery Charger
Simple, compact charger for the BT-DN320 battery. -
CN-M8100 Chain
SIL-TEC treated chain with excellent retention and quick-link installation.
Why XT Di2 M8200?
This Enduro-focused Di2 drivetrain system brings wireless precision, intelligent gear selection, and rock-solid reliability to every ride. With a wide gear range, rugged construction, and Shimano’s smartest shifting to date, it’s built to meet the demands of modern mountain biking.
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. |
Crankset
| Model: | XT M8220 |
| Crank Arm Model ID: | FC-M8220 |
| Chainring Model ID: | SM-CRM86 |
| Material: | Aluminum |
| P.C.D: | Direct |
| Chainline: | 55mm |
| Q-Factor: | 176mm |
| Chainring Teeth: | 28t, 30t, 32t, 34t, or 36t |
Shifter
| Model: | XT M8250 |
| Model ID: | SW-M8250-R/IR |
| Shifter Type: | Wireless |
| Orientation: | Right |
| Clamp: | 22.2mm Band Clamp (SW-M8250-R), I-Spec EV (SW-M8250-IR) |
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 Deore XT Di2 M8200 Enduro Drivetrain is 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:
