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 Shimanos 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.

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