Deore XT RD-M8100 Rear DerailleurMedium cage derailleur for 12-speed drivetrainOffers fast and shockless shifting thanks to HYPERGLIDE+ technologyThe low-profile design includes a bumper added to the derailleur pulley cageShimano Shadow RD+ technology reduces chain slap and creates a quieter drivetrainIncludes large 13t pulleyDrivetrain is silent in all gear positions with decreased rear derailleur and chain tension in low gearItem SpecificationsCage LengthMediumColorBlackDrivetrain Speeds12Largest Cog45Rear Der/Shifter CompatibilityShimano MountainRear Derailleur Mount Type10x1 StandardRear Derailleur Mount TypeShimano Rear Direct Mount Shimano Deore XT RD-M8100 Rear Derailleur UPC: 192790897097