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. FEATURES: Features at least five one-tooth jumps for a smoother gear progression 10-tooth start helps provide a wider gearing range Designed to work with an XDR driver body MINI CLUSTER construction reduces weight and increases durability All Zipp wheels starting from 2012 are XDR ready SRAM Force XG-1270 cassettes sold prior to 2021 have a black finish. In 2021, the design was updated to a nickel-chrome finish. SPECS: Speed (CS): 12 Gearing: 10-28t, 10-30t, 10-33t, 10-36t Cog finish (Cassette): Silver Technology (Cassette): XG Cog sizes: 10-28t; 10,11,12,13,14,15,16,17,19,21,24,28, 10-30t: 10,11,12,13,14,15,17,19,21,24,27,30, 10-33t; 10,11,12,13,14,15,17,19,21,24,28,33, 10-36t: 10,11,12,13,15,17,19,21,24,28,32,36 Driver body interface: XDR Drivetrain Configuration: 1x, 2x Cassette Size (Max): 28, 30, 33, 36 Cassette Size (Min): 10 Chain Technology: Road Flattop D1, Road Flattop E1