The 10-speed X-HORIZON rear derailleur makes shifting smooth & reliable no matter where you ride. Engineered to maintain consistent chain gap across all ten gears, X-HORIZON eliminates vertical movement for faster shifting, reduced shift force & an end to ghost shifting. ROLLER BEARING CLUTCH technology & the 12-tooth X-SYNC pulley wheels hold the chain in place, reducing bounce & chain slap. & CAGE LOCK technology makes wheel removal & installation easier than ever. Paired with the X0 10-speed shifter, X-HORIZON forms the backbone of EXACT ACTUATION technology—and that means completely smooth shifting action. With CAGE LOCK technology in the rear derailleur, wheel removal & installation—as well as chain installation—becomes faster & simpler. Just pushing the cage forward to create slack & lock it into place. Developed specifically for SRAM 1x, X-ACTUATION keeps shifting sharp & consistent across the entire cassette.ROLLER BEARING CLUTCH rear derailleurs deliver maximum drivetrain stability—even through the most punishing terrain. With ROLLER BEARING CLUTCH technology, derailleur bounce & chain slap are eliminated without sacrificing precision. The X-HORIZON rear derailleur’s ‘straight parallelogram’ design limits all movement to the horizontal axis, which makes ghost shifting impossible while also reducing shift force. For quicker, more exact shifting, the large upper pulley offset design maintains a constant chain gap across all gears.