Sram: RANGE OF DREAMS Whether for prized race machines or the build of their dreams, the XG-1299 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 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™ 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.FEATURESStronger riders can increase chainring size for speed, without sacrificing climbing.Eagle Colorsystem lets the cassette and chain express the look of the bike. Available in Black, Gold, Rainbow and all-new Copper.Provides a massive 520-percent gear range. SPECIFICATIONSSpeed (CS): 12sGearing: 10-52tCog finish (Cassette): Copper, Gold, RainbowTechnology (Cassette): XGCog sizes: 10-52t:10,12,14,16,18,21,24,28,32,36,42,52Driver body interface: XD