Our Cape Cod originally shipped with 4-ply tires(load range B), 35 psi max, according to the owners manual. When we bought it, it had load range C tires on it, 65 psi max which is what they were aired up to. When I bought tires for it, They were load range E, I know overkill, but the price was cheaper than Cs. Anyway they're rated for 95 psi. We run them at 65 psi, no problems....we're on year 2 with them.