Shimano XT RD M8100 GS Rear Derailleur 12 Speed, Medium Cage, Black crankset choose one wider than the 3660576149915 choose one wider than the 105 mm waist Karakoram Splitboard Spare Parts for the Alpine Primes The DEORE XT M8100 series of derailleurs offers an enhanced level of drivetrain silence achieved by reducing tension in the low gear position and adding a bumper to the pulley cage
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