Crankbrothers xd freehub body for sram xx1 cassettexd driver freehub for sram xx1 cassettescompatible with all 3rd generation cobalt or iodine wheels and with 2nd generation cobalt or iodine wheels with 14212 rear axle spacing note not compatible with 1st generation wheels features weight 137gbuy crankbrothers wheelsets from chain reaction cycles the worlds largest online bike store