jkirley..I have a set of the Performance Fast City ST/K tires, I keep them at max pressure (90 I believe) and they are fine. I ran a slick for 3 rides....wiped out on wet grass (which is better than asphalt) so no slicks for me. I see where the Ritchy Tom Slick (not a true slick) have a psi of 100...thats pumped and should really roll.