The Sram NX Rear Derailleur offers a quick and smooth shifting system for better acceleration and wheel installation, and it is also compatible with 42 teeth and 11 speeds. The bearing clutch eliminates chain bounce and bumps.The cage and pulley bearings of this bike rear derailleur are made of steel, for greater resistance and durability. The X SYNC technology provides good performance, easy shifting, and silent operation. The X HORIZON allows for faster and effortless shifting. Besides, it comes with a cage lock that wheel removal and installation easier. It features Exact Actuation technology that favors precision, speed, and silent operation.The SRAM NX X-HORIZON™ rear derailleur provides the same smooth, reliable shifting action as XX1™from the larger upper pulley offset to the 12-tooth X-SYNC™ pulley wheels.By eliminating unwanted chain movement, X-HORIZON™ shifts faster, puts an end to ghost shifting and reduces shift force and chain slap.And with CAGE LOCK™ technology, wheel removal and installation are easier than ever.Features:- X-HORIZON™ design that reduces shift force, ghost shifting and chain slap - 12-tooth X-SYNC™ pulley wheels - Fully compatible with all SRAM MTB 1x™ drivetrains - Most affordable fully featured 1x rear derailleur in the industry Specifications:- Speeds:11 - Weight:322g - Compatibility:X-ACTUATION™ - Bearings:Steel - Cage Sizes:Long - Max Tooth:42 Technology:X-ACTUATION™:- Developed specifically for SRAM 1x™, X-ACTUATION™ keeps shifting sharp and consistent across the entire cassette.For 2x10V systems.- Compatible with cassettes 11-42T.