I'm pretty dumb---it took me a couple of years to come to the realization that there is no such thing as a "correct" tire pressure. variables included, personal taste--do u like squishier ride or firmer? What size are the tires? what size are the wheels? what kind of tires?? what is the tire AGE (i find, remarkably, that older tires require MORE tire pressure) FOR ME, the driver's side FRONT gets 39 PSI passenger FRONT gets 37 both rears get 35. the tire wear appears pretty even on the front but there is a center-wear bias on the rear tires so i will need to lower the pressure on the rear. also, my tires are tripletreds on a 15X7 alloy wheel , the size is 215/60/15 which was upgraded from the OEM of p185/65/15 on a 2007 Corolla. the manufacturere recommends 30psi for front and rear.