Deore XT RD-M8100 Rear DerailleurLong cage is designed to be used with 1x12 drivetrain systemsOffers 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 LengthLongChain Wrap Capacity (teeth)41ColorBlackDrivetrain Speeds12Largest Cog51Rear Der/Shifter CompatibilityShimano MountainRear Derailleur Mount Type10x1 StandardWeight284 Shimano Deore XT RD-M8100 Rear Derailleur UPC: 192790443645