Original Cannondale CZero mountain bike rear hub. CZero rear wheels are configured for 28 straight pull spokes. Can be used with 142x12 axles and Shimano 11 speed cassettes as configured. You can adapt it for use with a SRAM XD freehub body and 135mm quick release skewers with optional parts. This kit includes the hub assembled as pictured with Shimano compatible freehub body, 142x12 axle adapters, and a spare cromoly axle.