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™. Just go: Apex 1 will get you there.Features:- Long cage fits up to a 42 tooth cog- With CAGE LOCK™ technology, wheel removal and installation are easier than ever- Compatible with 10-speed and 11-speed SRAM 1x™ road systems- Equipped with Roller Bearing Clutch™- X-HORIZON™ design reduces shift force, eliminates ghost shifting and chain slap- Large upper pulley offset automatically adjusts chain gap- Steel cageSpecifications:- Speed: 11- Cable pull ratio: Exact actuation- Cage: Long- Max tooth: 42- Pulley bearings material: Steel- Cage material (RD): Aluminum