SRAM GX 2 x 11 Speed Rear DerailleurSRAM GX 2 x 11 Speed Rear Derailleur Leveraging the legendary history of SRAM shifting, the GX 2x11 rear derailleur gives incredible shifting speed and precision. X ACTUATION technology eliminates slop and shifting variation. Roller Bearing Clutch technology delivers maximum drivetrain stability even through the most punishing terrain. And with Cage Lock technology, wheel removal and installation are easier than ever. X ACTUATION for precise and