The Sram Rival 1 Type 3.0 Rear Derailleur has been designed for 1x transmissions with a capacity between 36 and 42 teeth and 11 speeds, while their materials and technologies offer you fast and effortless shifting, chain tension, and includes a bearing clutch that eliminates wheel bounce and chain bumps.This bike rear derailleur is made of aluminum, while the pulley bearings are steel. The X SYNC technology provides good performance, simple shifting, and silent operation. The X HORIZON allows for faster and effortless shifting. Besides, it comes with a cage lock that makes wheel removal and installation easier.SRAM Rival®:1; Rear Derailleur Your needs aren’:t; less demanding, they’:re; different.The SRAM Rival 1 rear derailleur is engineered for smooth, reliable shifting action, delivering 100% of what you demand.By eliminating unwanted chain movement, X-HORIZON™:shifts; faster, reducing shift effort and chain slap.X-HORIZON™:design; reduces shift force while eliminating ghost shifting and chain slap Large upper pulley offset automatically adjusts chain gap Sealed cartridge bearings and aluminum cage Specifications for SRAM Rival®:1; Rear Derailleur Speeds11-speed Weight269g –:Long; (11-36 through 10-42) cage lengths.Pulleys12-Tooth X-SYNC™:PullExact; Actuation™:Technology; Highlight(s)X-HORIZON™:,; EXACT ACTUATION™:,; X-SYNC™:,; ROLLER BEARING CLUTCH™:,; Cage Lock™: :For; 2x10V systems.- Compatible with cassettes 11-42T.