Thru Axle QRs are not included with kits & are available for individual purchase Standard QR kits include a Cromoly QR Old Disc 130 & old Disc 225 hubs with 15267 bearings cannot be converted to any thru axle standards The above kits only work on American Classic hubs Kits contain the necessary parts required to make the make the swap MTB FRONT HUBSDISC 130 - Can be converted between STANDARD QR 15MM THRU AXLE 9MM THRU AXLE QUICK RELEASE105 FRONT No Conversions are available for the 105 Front TERRAIN FRONT DISC - Can be converted between STANDARD QR 15MM THRU AXLE 9MM THRU AXLE QUICK RELEASELEFTY DISC No Conversions are available for the Lefty Disc MTB REAR HUBSDISC 225 - Can be converted between STANDARD QR 10MM X 135MM THRU AXLE 12MM X 142MM THRU AXLETERRAIN REAR DISC - Can be converted between STANDARD QR 10MM X 135MM THRU AXLE 12MM X 142MM THRU AXLESINGLE SPEED DISC - Can be converted between 12 mm x 142mm Thru Axle 10MM X 135MM THRU AXLE