the hpx tires suck my buddy just bought that tire a month ago spins all the time other people have posted up here saying there a crap tire as well(Busa05_KY @ Sep. 10 2006,12:05) Michelin does have a specially designed pilot power for big displacement bikes. It is the pilot power hpx i believe. These tires are rated at 200+ mph sustained speeds. They are also made of sightly different compounds, to accomadate the extra weight and torque.