SRAM GX 2x11 Speed Rear Derailleur Leveraging the legendary history of SRAM shifting, the GX 2x11 rear derailleur provides 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. With Cage Lock technology in the rear derailleur, wheel removal and installation as well as chain installation becomes faster and simpler. Just pushing the cage forward to create slack and lock it into place. Roller Bearing Clutch rear derailleurs deliver maximum drivetrain stability even through the most punishing terrain. With Roller Bearing Clutch technology, derailleur bounce and chain slap are eliminated without sacrificing precision. Developed specifically for SRAM 1X, X-Actuation keeps shifting sharp and consistent across the entire 10- to 42-tooth cassette.