Upgrades an American Classic X.C. hub set for Freeride or DH applications. Converts a Rear Disc 225 9mm QR style hub to an X-12 142mm Rear Thru Axle HubOversize aluminum thru axle improves frame and fork rigidity, bike handling and suspension actionKit contains all parts necessary for conversion and only works on American Classic HubsThru Axle QR is NOT includedNOTE: American Classic Hubs with 15267 bearings cannot be converted with this kit Item SpecificationsFitsAmerican Classic X.C. Hub Set