Designed for smooth and fast shiftingGradual gear progression between cogs—at least five one-tooth jumps—while still offering a wider range10-tooth start helps provide a wider gearing rangeDesigned to work with an XDR driver bodyOne-piece machined steel X-DOME design for weight savingsAll Zipp wheels starting from 2012 are XDR readyRainbow colorway available in 10-28T and 10-33T cassettes