The RD-M9100 XTR rear derailleur is intended for use with 1x drivetrains. It is compatible with both 11- and 12-speed cassettes.

– Decreased rear derailleur tension at low gear position, to prevent high chain tension
– Added bumper at rear derailleur pulley cage
– Bigger 13T pulley
– Direct mount compatible
– Compatible cassette size: 10-51 (12-speed), 10-45 (11-speed)
– Total capacity: 35t (GS Medium Cage) / 41t (SGS Long Cage)