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 its 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