Wide development range or tight staggering? Why not both? The lightest and strongest of our cassettes innovates right down to the choice of gear ratio. Our four cassette options, including our first RED 10-30D and 10-36D, offer secure shifting ramps specifically designed for electronic groupsets, whether for road racing with a 10-28 cassette or for all-road configuration with a 10-36 cassette. Carefully selected gear ratios offer both the right developments for steep climbs and tight shifts to hold your rivals' wheels as they approach a sprint.