Designed for use with SRAM's proven Eagle drivetrain, using the reliable XD™ Driver Body, this 12-speed, 10 - 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 and outboard shifting, as well as chain retention. With a massive 10-50 tooth range and 500% gearing ratio, nothing matches the performance of the Eagle Cassette. Pick up a new Eagle XG-1299 12 Speed Cassette as part of your upgrade to Eagle. Features: Greatest durability and lightest weight in class Smoother, quieter system with enhanced inboard and outboard shift performance XD driver body compatible 10, 12, 14, 16, 18, 21, 24, 28, 32, 36, 42, 50