cassette xg 1290 d1 12 speed 10 28The workhorse of X Range gearing. The SRAM RED XG 1290 cassette progresses fluidly and quickly through a wider range of gears. It's specifically designed for wireless electronic shifting and the one piece design offers you the best in weight savings. Speed (CS): 12s Gearing: 10 26t, 10 28t, 10 33t Cog finish (Cassette): Silver Technology (Cassette): XG Cog sizes: 10 26t; 10,11,12,13,14,15,16,17,19,21,23,26, 10 28t; 10,11,12,13,14,15,16,17,19,21,24,28,