SRAM X1 Rear Derailleur - Type 2.1 - 11 Speed

Sram:

Every detail of the 11-speed X1 X-HORIZON rear derailleur is engineered for smooth, reliable shifting action- from the larger upper pulley offset to the 12-tooth X-SYNC pulley wheels. By eliminating unwanted chain movement, X-HORIZON shifts faster, puts an end to ghost shifting and reduces shift force and chain slap. And with CAGE LOCK technology, wheel removal and installation are easier than ever.