SRAM™s Apex 1 drivetrain provides 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™.Features:- 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 Specifications:- Cage size:Long - Max Tooth:42t - Pulleys:sealed cartridge bearings - Compatible with 10-speed and 11-speed SRAM 1x™ road systems - Weight:314 gr - Outer cage material:aluminium - Inner cage material:steelFor 2x10V systems.- Compatible with cassettes 11-42T.