Includes Shimano XTR Di2 M9250 Rear Derailleur – Optimized for impact survivability, the 12-speed mid-cage M9250 rear derailleur is the choice for both Shimano's top enduro athletes and weight-conscious XC racers alike, especially when matched with the 9-45 compact cassette.

Wireless Di2 Platform – Redesigned Di2 system provides fast, precise wireless shifting for reliable, uncompromising performance.

Automatic Impact Recovery – Rear derailleur automatically resets itself after impacts for continuous, uninterrupted performance.

Heavy-Duty Rear Derailleur Construction – Wide link design, carbon plate, skid-plate body, and solid pulleys ensure durability and reduce debris entry.

Chain Stability Dual – Dual spring chain stabilization technology improves chain wrap and retention across terrain.

Battery Protection – The onboard battery is sealed and tucked inside the derailleur for maximum protection while remaining removable for charging.

Multi-Mode Wireless Shifting – Di2 RAPID ES shifter allows hold-down multi-shift, double shift, or single-click modes—all customizable via the E-TUBE app.

Tactile, Programmable Controls – Four-way paddle adjust and programmable third button for full control over shifting, bike computers, or FREE/AUTO SHIFT functions.

Compatible Chain – HG 12-Speed