What Our Gearhead(R) Experts Are Saying: "I've recently started using the M9250 kit with the bar clamp option, and setup was smooth and clean. The wireless shifting is instant, and the derailleur's auto-recovery feature came in clutch after a rock strike mid-ride."Whether we're building a lightweight XC rig or a fast-and-rowdy trail machine, the Shimano XTR M9250 Di2 Drivetrain Upgrade Kit delivers the next level of wireless shifting precision. Available with either a mid-cage or long-cage rear derailleur and your choice of I-Spec EV or bar clamp switch, the M9250 upgrade kit is tailored to fit your bike and your ride style. Featuring Shimano's wireless Di2 system, the rear derailleur shifts with crisp speed and absolute accuracy-even under load. Automatic crash recovery kicks the derailleur back into place after impact, while the compact shifter delivers tactile response and multi-mode adjustability. Whether you're charging climbs, chasing PRs, or carving switchbacks, this kit sets a new benchmark in wireless drivetrain performance.