・Rear derailleur SHIMANO SHADOW RD+ 1x12 speeds・Fast, precise gear changes for modern mountain bikes・Silent transmission in all engaged gears"Reduced rear derailleur and chain tension on large sprockets"Larger 13T sprocket・Stable transmission on rough terrain"Compact profile design limits damage from stones and roots"Chain stabilizer reduces chain jumping, rattling and noiseThe all-new SHIMANO DEORE M6100 rear derailleur offers advanced shifting performance with reduced tension on the cassette's largest sprockets. Larger 13T rollers improve efficiency and chain management, while compatibility with the new SHIMANO 12-speed cassettes expands the possibilities.