A little more info. We found the above to be true also but playing with the pressures to find the sweet spot helped. We found that Mickeys liked 12 to 13 psi, Hoosiers liked 13 to 14, Phoenix, again 13 -14 and Toyo's 14 -15. These were all designated 29.5 x 10.5 x 15. Tyre pressures were taken at the pit after a run so cold they were a lot less. The Phoenix, though the same size designation, was a lot taller than the others. unfortunately they touched the body work when they grew, we only used them for 1/2 a season because of that.