Used Rolf Prima VCX tubular disc thru axle wheelset. With Continental Gatorskin 700 x 25 tubular tires mounted. Front holds air, rear does not. Six bolt disc mount. Presta valve, 12 mm thru axle, 37 mm freehub body, Shimano splined, measured 37 mm, so 10, 11 speed, depending on cassette. Bearings feel fine, needs a truing, lots of scratches on rear, front in better shape. Sold as is. US shipping only.