The Shimano Deore XT RD-M8100 rear GS derailleur offers fast and precise shifting performance optimized to take on any trail. Offers fast and shockless shifting thanks to HYPERGLIDE+ technology. 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. Drivetrain is silent in all gear positions with decreased rear derailleur and chain tension in low gear. Extra wide range with front double 36-26T & close step 12-speed drivetrain with low sprocket combination -10-45T. Weight: 290g.

 Cage Length: GS/Medium.

 Total Capacity: 45T.

 Mount: Direct attachment (conventional)/Direct mount compatible.

 Guide Pulley Bearing: Sealed Bearing.

 Tension Pulley Bearing: Sealed Bearing.

 Largest Cog: 45t.

 Drivetrain Speeds: 12.