Shimano XT M8100 12 Spd MTB Rear Derailleur

Shimano XT M8100 Rear Derailleur   For 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), 51t (long cage) Low Sprocket Min: 45t Max Front Difference: 0t Cage Length: choose; GS Medium Cage, or SGS Long Cage Rear Speeds: 12 Top Sprocket Max: 10t Top Sprocket Min: 10t Total Capacity: 35t (medium cage), 41t (long cage)