Maximum range, minimum fuss. This SRAM XPLR PG-1231 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 12-Speed cassette is designed for use with XPLR 1x rear derailleurs 400% range gives the coverage 1x riders want Compatible with SRAM 12-Speed Flattop chains Nickel Chrome finish provide extra protection for a longer life For use with 11-Speed road driver bodies Cassette Body Type: Shimano HG-11 Drivetrain Speeds: 12 Range: 11-44 Cassette Cogs: 11-12-13-15-17-19-21-24-28-32-38-44 Color: Silver