Shimano

XTR M9250-IR Di2 Wireless Upgrade Kit - M9250-GS Rear Derailleur, M9250-IR I-SPEC EV Shifter, Batter

Shimano XTR M9250-IR Di2 Wireless Upgrade Kit brings XTR-level 12-speed wireless shifting to modern mountain bikes with a derailleur built to survive real trail impacts and an I-SPEC EV shifter that dials in fit, feel, and shift behavior. Centered around the XTR M9250-GS medium-cage rear derailleur and SW-M9250 Rapid ES wireless shifter, this kit is a focused upgrade for riders who want fast, precise shifting with a cleaner cockpit and a drivetrain that stays working when the trail gets rough.

Kit includes XTR M9250-GS Di2 wireless rear derailleur, M9250-IR I-SPEC EV Rapid ES wireless shifter, BT-DN320 battery, EC-DN100 charger, and SM-CN910-12 Quick Link (chain not included).

Key advantages for trail and race use

1. Impact-focused derailleur architecture - An impact-deflecting profile, protected pulley design, and Automatic Impact Recovery help the derailleur shed hits and return to position, reducing trail-side adjustments after rock strikes.
2. Shadow ES chain management - A slimmer, stronger evolution of Shimano’s Shadow concept helps keep the derailleur tucked in and improves chain stability for rough descents and high-torque climbs.
3. Rapid ES I-SPEC EV ergonomics - Multi-axis, four-way adjustability allows precise lever placement for a natural reach from the grips, supporting better control when shifting under load.
4. Selectable shift behaviors + third-button tuning - Choose single-shift lockout, click-through double shift, or hold-down multi-shift; the programmable third button (via the E-TUBE app) adds system control without cluttering the bar.
5. Secure, serviceable power system - The BT-DN320 battery sits in an enclosed derailleur location for retention in rough terrain while remaining removable for charging with the included EC-DN100.

Note: Optimized for use with the Shimano XTR CS-M9200-12 9-45T cassette (sold separately); performance with HYPERGLIDE+ depends on using compatible Shimano 12-speed drivetrain components.