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 derailleurs400% range gives the coverage 1x riders wantCompatible with SRAM 12-Speed Flattop chainsNickel Chrome finish provide extra protection for a longer lifeFor use with 11-Speed road driver bodies