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)