Shimano’s XTR M9250 Di2 12-Speed Kit ushers in a new era of wireless electronic mountain bike drivetrains, purpose-built for XC racers and aggressive trail riders alike. At the heart of the kit is the RD-M9250 rear derailleur—available in GS (mid cage) and SGS (long cage) variants—offering compatibility with 9-45T and 10-51T cassettes respectively. Utilizing Shimano’s proven HYPERGLIDE+ shifting technology, it delivers lightning-fast shifts under load with zero cable clutter. The redesigned wedge-shaped profile improves ground clearance by 23mm and incorporates a durable carbon cage, wide-link construction, and a built-in skid plate. The SHADOW RD+ ES system stabilizes chain motion on rough terrain, while Automatic Impact Recovery automatically repositions the derailleur motor after a crash, maintaining reliable performance through every mile. Due to multiple options and sizes being available, riders will need to choose and purchase their cranksets, cassettes, and other components separately from the XTR 9250 kit.

Complementing the derailleur is the XTR SW-M9250-IR Di2 shifter, which features a refined, low-profile design with customizable shift logic through Shimano’s E-Tube app. Riders can select from multiple shift modes—including two-step, multi-shift, or single-shift lockout—and a programmable third button allows integration with e-bike or third-party systems. The I-SPEC EV mounting system and textured contact surface ensure ergonomic, confident operation. Powering the system is the compact BT-DN320 battery, integrated into the derailleur body for protection and weight optimization. With 310 mAh capacity, it offers long-lasting performance and is easily removable for charging via the EC-EN100 compact charger, designed specifically for Shimano’s wireless Di2 systems.

To complete the drivetrain, the kit includes the CN-M9100 12-speed chain, a critical component of Shimano’s Hyperglide+ platform. Optimized for smooth engagement and retention under wide cassette ranges, it features SIL-TEC surface treatment for reduced friction and extended durability. The chain’s chamfered plates and Quick Link (SM-CN910-12) improve shift precision while minimizing wear. Together, the XTR M9250 Di2 system offers an elite-level drivetrain package with precision, power, and trail-proven resilience.

The Shimano XTR M9250 Di2 Kit represents the pinnacle of wireless mountain bike drivetrain technology, delivering a seamless integration of speed, control, and reliability. With its cable-free setup, automatic crash recovery, and precision tuning capabilities, it offers a high-performance solution for elite racers and demanding trail riders alike. Every component in the system—from the rugged rear derailleur and programmable shifter to the durable, low-maintenance battery and chain—has been engineered to perform under the most extreme conditions. Whether navigating tight switchbacks, hammering climbs, or flying down rocky descents, the XTR M9250 Di2 system enhances ride quality with intuitive gear changes, reduced mechanical complexity, and a streamlined setup. For riders seeking the ultimate blend of performance, customization, and durability, this wireless kit redefines what's possible on the trail.