For cross country racing, there are some exceptionally fast clincher wheels out there, but there is nothing that compares to the speed, control, and low weight of a carbon tubular wheelset. The same can often be said of Shimano's XTR groupset, so what happens when the two intersect' You get marvelous hoops like the new Shimano XTR M9000 TU Race 29 inch Tubular Wheelset. Whereas the new XTR 9000 clincher wheelsets are made with a proprietary carbonaluminum hybrid construction process to capitalize on the advantages of both materials while keeping cost reasonable, these tubulars go all out, with rims rendered in full carbon for incredible strength, wonderful ride quality, and insanely low weight. Down in the hubs, proprietary bearings keep the precision machined hubs spinning for years, and a revised axle and bearing configuration saves a bit of weight, as well. The Shimano XTR M9000 TU Race 29 inch Tubular Wheelset comes with a 142x12mm rear axle, and 100x15mm front axle, and a freehub body that can accommodate Shimano 10 or new 11 speed XTR drivetrains. Both front and rear wheels have 28 spokes, and both are compatible with CenterLock rotors only.