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.More gradual gear progression between cogs (at least five one-tooth jumps) while still offering a wider rangeOne-piece machined steel X-Dome design offers strength with weight savings10-tooth start helps provide a wider gearing rangeDesigned to work with an XDR driver body