The Shimano XT M8100 series of derailleurs brings a new level of drivetrain silence thank to decreased tension in the low gear position and an added bumper on the pulley cage. Larger 13T pulleys increase efficiency and chain management while compatibility with SHIMANO's new 12-speed cassettes boosts range. Â Features: Fast and precise shifting performance optimized to take on any trail. Silent drivetrain in all gear positions. Stable drivetrain on rough terrain. Faster and shockless shifting. Low-profile design. Wide range 12-speed drivetrain with low sprocket combination -10-51T. Decreased rear derailleur and chain tension in low gear. New bumper added to rear derailleur pulley cage. Bigger 13T pulley. Â
