After a year and a half on my roadie with 700x23 at 100psi I went to 700x32 at 85psi which is as big and pumped as the fork and frame will handle (1984 Nishiki International). Rolls as good as ever, plus a little more comfort, but mostly better cornering. My other bike rolls 26x 1.75 street tires at 65psi. Very secure ride esp corners.