The SRAM RED AXS XG-1290 cassette is an integral part of the RED AXS drivetrain system. With a 10-tooth small cog and X-Range gearing, it progresses fluidly and quickly through a wide range of gears. Carefully chosen tooth jumps keep the rider in the right gear when you're out of the saddle on steep climbs and making fine changes to hold a wheel while approaching a sprint. These cassettes are designed specifically for wireless electronic shifting, and the one-piece design offers exceptional weight savings. The XG-1290 cassette is designed to operate with XDR driver bodies.Features-More gradual gear progression between cogs (at least five one-tooth jumps) while still offering a wider range-One-piece machined steel X-Dome design offers strength with weight savings-10-tooth start helps provide a wider gearing range-Designed to work with an XDR driver bodyItem Specifications-Range:10-33-Cassette Cogs:10-11-12-13-14-15-17-19-21-24-28-33-Cassette Body Type:SRAM XDR-Drivetrain Speeds:12-Color:Rainbow-Defined Color:Multi-Color