SRAM Cassette PG-1231 XPLR 12-Speed Maximum Range, Minimum Fuss Cassettes can quickly change how easy it is to climb steep hills. With a wider range on your cassette, even the most difficult terrain will feel like a breeze. The SRAM Cassette PG-1231 XPLR 12-Speed provides 2x the 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. Features For use with XPLR 1x rear derailleurs Compatible with Flattop chains Works with 11-speed road driver bodies Specifications Cassette Body Type11-Speed Road Driver Bodies Cassette Cogs11-12-13-15-17-19-21-24-28-32-38-44Drivetrain Speeds12Cassette Material Aluminum Weight N/A | Rockshox | Sram Cassette Pg-1231 Xplr 12 Speed Am Cs Pg 1231 D1 Xplr 11-44