Shimano XT RD-M8100 Rear Derailleur GS CageFor 1x system 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 Decreased rear derailleur and chain tension in low gear New bumper added to rear derailleur pulley cage Bigger 13T pulley Compatible Chain: HG 12 speed Low Sprocket Max: choose; 45t (medium cage) Low Sprocket Min: 45t
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