SRAM’s Apex 1 drivetrain gives the gear range and the shifting simplicity to let you simply go where you want. The Apex 1 rear derailleur makes that gearing choice a reality with clean, crisp shifts, thanks to SRAM’s X-Horizon™ geometry and our Roller Bearing Clutch™.X-HORIZON™ design reduces shift force, eliminates ghost shifting and chain slap,Compatible with 10-speed and 11-speed SRAM 1x™ road systems,With CAGE LOCK™ technology, wheel removal and installation are easier than ever,Equipped with Roller Bearing Clutch™,Large upper pulley offset automatically adjusts chain gap,Long cage fits up to a 42 tooth cog.CAGE LOCK™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.SpecificationsWeight: 314gColors: BlackOuter Cage: SteelCompatibility: 10-speed and 11-speed SRAM 1x™ road systemsInner Cage: SteelCage Sizes: LongMax Tooth: 42tPulleys: Sealed cartridge bearingsPull: EXACT ACTUATION™