Axle conversion kits are required for converting your current hub to be used on various other axle platforms. Fits Chris King disc brake front hubs: ISO-B, serial number starting with 841 ISO-SD, serial number starting with 151 Uni Disc, serial numbers starting with 810 and 813 Not compatible with ISO-LD, Lefty, or ISO-AB Non QR axles require an adjusting clamp for installation If converting from QR to TA, you will also need a Low Profile Adjusting Clamp PHB587 / PHB587B 110mm x 15mm (Boost) PHB324 / PHB324B 100mm x 15mm PHB304 / PHB304B 100mm x 9mm QR PHB783 / PHB783B 100mm x 12mm PHB784 QR insert for 100mm x 12mm axle