The SRAM Apex 12-Speed Cassette fives you a greater gear range with minimal fuss. This 11-44 cassette provides a 1x package with its greater simplicity but with the range of a 2x. It can be fitted to a traditional 11-speed driver body for easy and broad integration. The smooth progression of each cog keeps the gap between cogs tightest when you need speed but with more meaningful gaps when you need to climb.12-speed / 11-44T400% rangeCog sizes: 11,12,13,15,17,19,21,24,28,32,38,44For use with XPLR 1x rear derailleursCompatible with Flattop chainsFor 11-speed road driver bodiesSpecification:Speed (CS): 12sGearing: 11-44tCog finish (Cassette): Nickel ChromeTechnology (Cassette): PGCog sizes: 11-44t:11-12-13-15-17-19-21-24-28-32-38-44