The SRAM X01Eagle 12 Speed Cassette kills the last dangling shred of an argument infavourof a mountain bike frontderailleur. Designed for use with a XD driver body, this 12-speed 10 to 50 tooth cassette offers an optimal 500% gear range at a considerably lighter weight than2xsystems. Features X-DOMEarchitecture, which, independent tests have concluded, yields the strongest cassettes on the market. New s SRAM X01 Eagle 12 Speed Cassette Features SRAM’s cassette manufacturing technology provides the greatest durability and lightest weight All-new shifting features create a 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