Sram: Maximum range, minimum fuss. This 12-speed 11-44T cassette provides 2x range in a 1x package and fits on a traditional 11-speed driver body for broad integration. The smooth cog progression keeps jumps between cogs tightest when it’s time to go fast, with more meaningful gaps for climbing.FEATURES12-speed400% 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 bodies SPECIFICATIONSSpeed (CS): 12sGearing: 11-44tCog finish (Cassette): Nickel ChromeTechnology (Cassette): PGCog sizes: 11-44t:11-12-13-15-17-19-21-24-28-32-38-44Driver body interface: Splined 11