Quote:
Originally Posted by 16ACE27
Small changes in ambient temperature result in small changes in cold tire pressure and are not enough to worry about, but I would bump those 90 PSI tires back up to 100 PSI in your new colder area.
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Correct. To reduce pressure from 100 to 90 PSI (about 10%), the temperature would have to drop in order of 50~55 F. It’s possible if starting in Texas or Florida where ambient temp could be around 90 F and then driving to cold weather area like Canada.
I’ve done that, and will add my “practical” take on this issue. If I’m going to tour for a week or two where it’s cold, and then head back to Texas or Florida, I will not adjust tire pressure due to cold weather. Mostly I leave tires alone for two reasons. First, the biggest danger of under-inflation is creating heat in tires, and since road and ambient air is colder, it self compensates.
Secondly, I always run my tires a little higher than the minimum required for the actual load; while still under the maximum tire rated pressure. I can do this because I avoid motorhomes that have chassis close to their full rated load. That way I have more tire pressure range to play with.
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