SRAM XG-1290 E1 Silver 12 Speed CassetteThe 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 youre 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