To read why SRAM Eagle is up there with Bike Radars Most Wanted Click Here To read our Staff Blog on the SRAM Eagle Groupset Click Here Designed for use with our proven, reliable XD™ Driver Body, this 12-speed, 10- to 50-tooth cassette offers an optimal 500-percent gear range at a considerably lighter weight than 2x systems. It carries with it the X-DOME™ architecture, which, independent tests have concluded, yields the strongest cassettes on the market. New shifting characteristics improve both, inboard & outboard shifting, as well as chain retention.