I went out on the dunes here in Michigan with my Yokos and did great! They have such stiff sidewalls that I aired down to 15lbs like they said and you couldn't even tell the tires were low. They questioned my about it before they let me out on the sand and I insisted that they were aired down. They do feel a little weird without the air though.... I keep them at 45lbs most of the time. Have fun! Check out some pictures on my webage below... they look totally pumped up!