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 performanceWireless 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 Shimano’s pioneering chain-stabilizing Shadow concept Wedge shape of Shimano’s 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 won’t budge even in rough terrain while remaining completely removable for charging
| Largest Cog | 51 |
| Rear Der/Shifter Compatibility | Shimano Mountain Di2 |
| Rear Derailleur Mount Type | Shimano Rear Direct Mount |
| Drivetrain Speeds | 12 |
| Chain Wrap Capacity (teeth) | 41 |
| Cage Length | Long |
| Color | Black/Silver |
| Weight | 391 |
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