The SRAM GX 10-speed rear derailleur provides incredible shifting speed and precision. The Exact Actuation shifting technology eliminates slop and shifting variation, so the derailleur always goes exactly onto the cog, with no need to "nudge" it into place. Roller Bearing Clutch technology delivers maximum stability and chain retention, even in the most punishing terrain. And with Cage Lock technology, wheel removal and installation is easier than ever.