The Shimano Di2 XTR M9250 wireless long cage derailleur paired with a standard 10-51t M9200 cassette (cassette sold separately) gives riders and racers the speed, range, and robustness to tackle every trail on the mountain. With built-in Automatic Crash Recovery, an impact-deflecting shape, and simple covered-pulley solutions, this derailleur stands up to harsh trail impacts and still retains its lightning-quick shifting speed and top-level performance

• Wireless Di2 paired with HYPERGLIDE+ technology result in smooth, precise and instantaneous shifts
• Wide link structure, skid-plate design, durable carbon plate and solid pulley add robustness and longevity
• Automatic Impact Recovery function instantly returns the derailleur motor to its original position after impact
• Shadow ES provides a slimmer, stronger evolution of Shimanos pioneering chain-stabilizing Shadow concept
• Wedge shape of Shimanos most survivable rear derailleur to-date avoids more direct impacts, and smoothly glances off rocks if there is a hit
• Tucked safely inside an enclosed space, the battery wont budge even in rough terrain, while remaining completely removable for charging

Specifications

• Color:Black/Silver
• Largest Cog:51
• Rear Derailleur Mount Type:10×1 Standard , Shimano Rear Direct Mount
• Chain Wrap Capacity (teeth):41
• Cage Length:Long
• Rear Der/Shifter Compatibility:Shimano Mountain Di2
• Drivetrain Speeds:12
• Weight:391