Whether for prized race machines or the build of their dreams, the SRAM XX1 XG-1299 10-52T MTB Cassette is the ultimate, giving riders unprecedented 520-percent range thanks to the new 10-52 tooth-span. Stronger racers are now free to choose larger chainrings for more top-end speed, without sacrificing climbing range. More time is spent higher up in the cassette where athletes power transfer is most efficient and wear is minimized. Featuring the industrys strongest X-Dome architecture and proven XD driver body, its also backwards compatible to give riders even more Eagle upgrade options for their current bikes. With multiple Olympic, World Cup and World Championship titles, it also matches up perfectly to XX1 Eagle AXS enabled componentry. The XG-1299 cassette utilizes the full depth of the new Eagle Colorsystem. Available in Black to Gold to Rainbow and all-new Copper, the XG-1299 cassette completes the expression of the worlds most accomplished and sought after bikes. Key Features: - 10-52T - 0-12-14-16-18-21-24-28-32-36-42-52T - Compatable with Eagle Chains Only - Only compatible with XD Driver Body - Please note that the 10-52T cassettes are only compatible with the NEW Lunar Rear Deraileurs - Chromely Steel Cogs, Aluminium 52t Cog - 520% Range - 350g Weight