Popsie wrote:
wolfe10 wrote:Good answers.
Cold is at ambient temperature (be it 0 or 110 degrees F) before driving, and as suggested before sun heats up one or more tires.
So you WILL readjust PSI at least seasonally.
Well, I recently concluded an experiment. I set my pressures correctly once, and drove for two years without making any pressure changes. I did check my pressures in the morning on driving days, and used my IR gun at stops on the road. At the end of 2 years, my tires were at almost the same pressures as when I started out, and they were never out of line when checked in the am.
But physics dictates that PSI will change approximately 1 PSI for every 10 degrees F. So that 0 to 110 (outer extremes cited above) would cause a PSI change of over 10 PSI.
