Sram: Designed for the next generation of drivetrains—and the next generation of riders. The SRAM Force® XG-1270 cassette is optimized for electronic shifting and features our X-Range™ gearing technology. Smooth, precise shifts, from 10T on up.FEATURESX-Range™ gearing gives you more range and a smoother gear progression, so you’re always in the right gearMINI CLUSTER™ construction reduces weight and increases durabilityDesigned to work with an XDR™ driver bodyAll Zipp wheels starting from 2015 are XDR™ readyNow includes 10-36 option for even more range (must be used with the correct Force eTap AXS rear derailleur) SPECIFICATIONSSpeed (CS): 12sGearing: 10-36tCog finish (Cassette): BlackTechnology (Cassette): XGCog sizes: 10-36t:10,11,12,13,15,17,19,21,24,28,32,36Driver body interface: XDR