ArchiTorture

The other day I was driving with my girlfriend in her Honda and we noticed that her tires needed air. When I checked them with my guage the pressure read 36 psi (the recommended pressure for her car) but the tire looked seriously low. I double checked it with another guage and it read the same. My question is, how can a tire look so low, but still read the correct pressure? BTW, I filled her tires up to 40 psi (the max pressure stated on the tire itself) just so that they wouldn't look so low.

TTschwing

They were probably fine....Tire pressures will increase a few lbs as they heat up. Most Honda's spec 29-30 lbs if I remember....(without going out to check!)

ArchiTorture

it was pretty warm out... I'm in Houston

TTschwing

Like in the morning before you've driven anywhere. Driving causes heat which raises pressures. All manufacturers specs are "cold" pressures.......