Designed for the next generation of drivetrains and the next generation of riders. The SRAM Force XG-1270 cassette is optimized for electronic shifting and features our X-Range gearing technology. Smooth, precise shifts, from 10T on up.- Features at least five one-tooth jumps for a smoother gear progression- 10-tooth start helps provide a wider gearing range- Designed to work with an XDR driver body- MINI CLUSTER construction reduces weight and increases durability- All Zipp wheels starting from 2012 are XDR-ready- SRAM Force XG-1270 cassettes sold prior to 2021 have a black finish. In 2021, the design was updated to a nickel-chrome finish.