Optimized for impact survivability, the 12-speed XT RD-M8250 medium cage rear derailleur is the top choice for everyday trail riding, offering unmatched durability, quick, precise shifts and added weight savings when paired with the 9-45t compact cassette (cassette sold separately). Featuring all-new wireless Di2 shifting, automatic impact recovery, a 500% gear range and 23 millimeters of additional ground clearance for a bash-free ride, the M8250 rear derailleur is built to be relentlessly reliable so you are free to focus solely on the trail ahead.