The XX1 11-Speed Rear Derailleur
- Type 2.1 from SRAM was built with a dedicated 1X drivetrain philosophy, making it simpler, lighter & more durable. The Type 2.1 now features an internal change to the clutch mechanism which improves performance & longevity compared to the previous Type 2. It uses X-Horizon's horizontal parallelogram design & pulley offset to keep the chain gap constant across all 11 gears, providing fast & precise shifts. By limiting all movement to the horizontal axis, this design is faster, reduces shift force & eliminates ghost shifting. The roller bearing clutch technology reduces bounce & chain slap & the cage lock technology makes wheel & chain removal & installation faster & simpler. The derailleur has 12-tooth X-Sync pulley wheels with a large upper pulley offset which automatically adjusts the chain gap for smoother running. Available in Silver/ Black/ Red in one size.