The Shimano Deore XT RD-M8100/M8120 rear derailleur is designed to provide smooth and stable shifting for 12-speed MTB drivetrains.

- Offers fast and shockless shifting
- The low-profile design includes a bumper added to the derailleur pulley cage
- Shimano Shadow RD+ technology reduces chain slap and creates a quieter drivetrain
- Includes large, 13T pulley
- Long cage is designed to be used with 1x12 drivetrain systems
- Rear Derailleur Mount Type: Shimano Rear Direct Mount, 10x1 Standard
- Drivetrain Speeds: 12
- Cage Length: Long
- Chain Wrap Capacity (teeth): 41 teeth
- Largest Cog: 51
- Weight: 284 g
- Rear Der/Shifter Compatibility: Shimano Mountain