SRAM XX1 Cassette 10-52T 12sWhether 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 industrys strongest X