Shimano XTR RD-M9250-GS Di2 Wireless Rear Derailleur - 12-Speed Medium Cage Shadow ES Black/Gray. Optimized for impact survivability the 12-speed XTR RD-M9250 medium cage rear derailleur is the choice for both Shimano’s top enduro athletes and weight-conscious XC racers alike especially when matched with the 9-45t compact cassette (cassette sold separately). Featuring all-new wireless Di2 shifting automatic impact recovery a redesigned wedge shape and 23 millimeters of additional ground clearance for a bash-free ride this rear derailleur stands out for the speed of its shift and its ability to keep riders competitive on the trail.

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 design 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