Tire pressure fluctuation when hot
Via my tire pressure monitor kit, I noticed that my tire pressures in all 6 tires increased uniformly by as much as 18psi from cold pressure on a long trip thru the desert. Is this normal? I drive...
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It would be abnormal if they didn't rise in psi once warmed up. An 18psi increase is a bit on the high-side but I've seen our psi increase nearly that much on a couple of occasions. As long as they return to cold psi setting more than likely all is well. Many worry excessively about the psi increase but engineers have factored in this normal occurrence when designing the tire. It's the main reason why psi should only be adjusted when tires are cold.
