Whether for prized race machines or the build of their dreams, the XG-1299 cassette is the ultimate, giving riders up to a 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 the athlete's power transfer is most efficient and wear is minimized. Featuring the industry’s strongest X-Dome™ architecture and proven XD™ driver body, it’s 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™ Color system. Available in Black to Gold to Rainbow and all-new Copper, the XG-1299 cassette completes the expression of the world's most accomplished and sought-after bikes. Details: Speed: 12-speed Gearing: 10-50t, 10-52t Technology (Cassette): XG Cog Sizes 10-50t: 10,12,14,16,18,21,24,28,32,36,42,50 Cog Sizes 10-52t: 10,12,14,16,18,21,24,28,32,36,42,52 Weight 10-50t: 360 g | 10-52t: 374 g Compatibility: Chain: All SRAM Eagle 12-speed chains Freehub: XD Driver Rear derailleur (10-50t): All SRAM Eagle rear derailleurs Rear derailleur (10-52t): All SRAM Eagle 52t rear derailleurs