New in Box Designed for smooth and fast shifting Gradual gear progression between cogs—at least five one-tooth jumps—while still offering a wider range 10-tooth start helps provide a wider gearing range Designed to work with an XDR driver body One-piece machined steel X-DOME design for weight savings All Zipp wheels starting from 2012 are XDR ready Rainbow color COG SIZES: 10,11,12,13,14,15,17,19,21,24,28,33 Speed: 12 .
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