The Shimano XTR M9100 is designed to withstand full force pedalling on the roughest trails, with smooth shifting and exceptional chain stability. It offers enhanced shifting performance, a low profile design, and low sprocket compatibility. Designed with a Shadow RD+ clutch to reduce chain slap and create a quiet drivetrain with less distraction. Decreased rear derailleur tension at low gear positions prevents high chain tension. Features a larger 13-tooth pulley. For use with 1x11 and 1x12 set ups. Will accommodate up to a 51-tooth cog.