The SRAMâ„¢ Apex 1 drivetrain offers the speed range and simplicity of shifting to allow you to easily go wherever you want.The Apex 1 rear derailleur makes this gear choice a reality with clean and crisp shifts, thanks to the SRAMâ„¢ X-Horizonâ„¢ geometry and our Roller Bearing Clutchâ„¢ technology.Features:The X-HORIZONâ„¢ design reduces shifting force, eliminates ghost shifting, and chain slapCompatible with SRAM 1xâ„¢ 10-speed and 11-speed road systemsWith CAGE LOCKâ„¢ technology, removing and installing the wheel is easier than everEquipped with Roller Bearing Clutchâ„¢The large upper pulley offset automatically adjusts the chain gapThe long cage fits a maximum sprocket of 42 teethSpecifications:Cage size: LongMax tooth: 42tPulleys: sealed cartridge bearingsCompatible with SRAM 1xâ„¢ 10-speed and 11-speed road systemsWeight: 314 gOuter cage material: AluminiumInner cage material: SteelFor 2x10V systems.Compatible with 11-42T cassettes....