Prime Audax Quick Release Hub End CapsThis handy and easy-to-fit conversion kit is the ideal way to change your Audax Wheelset from a thru-axle system to a QR set-up. Featuring a frnt and rear cap to fit both hubs, this genuine prime kit is an excellent addition to your rapid road riding wheels. Features: Conversion: Front: Converts front hub to 100mm x QR axle standard; Rear: Converts rear hub to 135mm x QR axle standard Compatibility: Prime Audax wheelset only Buy Prime Wheels & Tyres from Chain Reaction Cycles, the World's Largest Online Bike Store.