Every detail of the 11-speed SRAM X1 X-Horizon rear derailleur is engineered for smooth, reliable shifting action. The 12-tooth X-Sync pulley wheels provide excellent chain engagement to eliminate unwanted chain movement. This solid chain engagement allows the X1 to shift faster with less force while putting an end to ghost shifting and chain slap. The integrated Cage Lock technology makes wheel removal and installation easier than ever.FeaturesX-Horizon design reduces shift force, ghost shifting and chain slap12-tooth X-Sync pulley wheelsLarge upper pulley offset automatically adjusts chain gapSealed cartridge bearingsAluminum CageSpecificationsColor: BlackWeight: 256gCassette Spacing: 11-SpeedCapacity: 32TMax. Cog: 42TCage Length: LongNew, Never Used, OEM, This item is exactly as pictured and does not include retail packaging.SRAM