SRAM 红色 10 速后变速器陶瓷滑轮 BlackBox 2011 短笼

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 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