Sram: JUST GOSRAM’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.THINGS TO REMEMBERLong cage: 11-42 cassette.With CAGE LOCK technology, wheel removal and installation are easier than everCompatible with 10-speed and 11-speed SRAM 1x road systemsEquipped with Roller Bearing ClutchFEATURES AND BENEFITSX-HORIZON design reduces shift force, eliminates ghost shifting and chain slapLarge upper pulley offset automatically adjusts chain gapSteel cageSPECIFICATIONSSpeed (RD)11sCable pull ratioExact actuationCage (RD)LongMax tooth42Color (RD)BlackPulley bearings materialSteelCage material (RD)Aluminum