Upgrade your existing 12-speed mountain bike drivetrain to fully wireless electronic shifting with the Shimano Deore XT M8250 Di2 Drivetrain Upgrade Kit. Designed for trail and enduro riders who demand precision and reliability, this kit bundles everything you need for a complete wireless Di2 installation in a single package — no wires, no mess, no compromise.

Highlights

• Wireless Di2 shifting: Bluetooth Low Energy and ANT+ wireless communication delivers instant, accurate shifts at the push of a button, even under heavy load on steep climbs or punchy accelerations.
• Automatic Impact Recovery: The RD-M8250-GS derailleur automatically realigns itself after a rock strike or trail impact, getting you back to precise shifting without stopping to straighten the mech.
• Shadow RD+ chain stabilisation: Integrated clutch mechanism reduces chain slap and drop on rough terrain, with a convenient on/off switch for easy wheel removal.
• I-Spec EV shifter integration: The SW-M8250-IR mounts directly to compatible Shimano Deore XT brake levers via the I-Spec EV interface, eliminating a separate clamp band for a clean, low-profile cockpit.
• Programmable third button: Assign a custom function to the additional button on the SW-M8250-IR via the E-TUBE PROJECT app — control suspension, lights, or other compatible accessories.
• Complete kit: Includes rear derailleur, shifter, BT-DN320 battery, EC-DN100 charger, and SM-CN910-12 12-speed quick link — everything required for installation in one box.
• 500% gear range: The GS mid-cage configuration supports Shimano's 9-45T compact cassette for a tightly spaced, lightweight setup suited to cross-country and trail riding.

Wireless Di2 Technology

Shimano's Di2 electronic shifting has long set the benchmark for precision and consistency, and the M8250 series takes it fully wireless. The SW-M8250-IR shifter communicates directly with the RD-M8250-GS rear derailleur via Bluetooth Low Energy and ANT+ wireless protocols — no junction boxes, no wire routing through the frame. Shifting is lightning-quick with short-stroke paddles, two-step double-shift capability, and a hold-down multi-shift function for rapid gear changes across the cassette.

Built for the Trail

The RD-M8250-GS is engineered to survive the demands of mountain bike riding. A wide link structure and skid-plate design protect the derailleur cage and pulleys from debris and rock strikes. Covered pulleys resist mud packing, while the Shadow RD+ clutch keeps the chain under tension over rough ground. When an impact does knock the derailleur out of alignment, the Automatic Impact Recovery function returns it to its original position so you can keep riding.

E-TUBE PROJECT App Integration

Connect to the Shimano E-TUBE PROJECT app via Bluetooth to customise shift modes, assign the programmable third button on the shifter, update firmware, and fine-tune derailleur settings. The BT-DN320 battery is housed in a protected, enclosed space within the derailleur body to shield it from mud, water, and impacts. Charging is via the included EC-DN100 USB-C compatible charger.

Compatibility & Fit

This kit is designed as a drop-in upgrade for existing 12-speed Shimano MTB drivetrains. The GS mid-cage RD-M8250-GS is compatible with Shimano 12-speed cassettes up to 45T maximum (including the CS-M8100 9-45T). The SW-M8250-IR shifter mounts via I-Spec EV to compatible Shimano Deore XT brake levers — confirm your levers feature I-Spec EV interface before purchase. The kit does not include a cassette or chain; a 12-speed chain is compatible with the included SM-CN910-12 quick link.