[Nevin]

I've actually replaced a lot of low-profile tires because people wear them out prematurely because of UNDER-inflation. If you're not sure what to run in your tires, you can never go wrong with what is written ON the tire. Why else would they put it there? 51 is a bit high for MOST cars though, unless your car is heavy. With a 51psi tire, you'd want to keep at least 40 in it, in my opinion.

I'm doing a saab 9-3 tomorrow actually that has 225/45-17's on it, and they wore out because he didn't keep enough air in them.

Guess he thought 32psi was enough in a 44psi tire...