I have 195/55/15's in kumho 712's, I usually fill them up enough to give a good semi-stiff sidewall, without bowing out the inner most section of the tire. I believe I have 32 in the front, and 26 in the rear. One of the best way's to tell if its the right tire pressure for you though aggressive driving. I messed with my pressure for a while, and saw that the handling and grip change very much with slight changes in tire pressure. Search on this forum or T-I, there is a write up on how to get the best pressure.