Quote:
Originally Posted by JRMichler
I recently put a new set of tires on my truck. The old tires were not quite down to the wear bars. The revolutions per mile changed about 1%. There is also a tire pressure effect where increased pressure reduces the revolutions per mile. I do not know if that effect is significant, but it is definitely there.
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Quote:
Originally Posted by mcrews
it's a steel belt.....40 or 50 psi isnt going to change the diameter
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Seems to me it could, if the lower pressure is allowing a flat spot. The smaller effective diameter of the flat spot leads to higher revs/mile. Increasing pressure can push that out closer to round, making the tire act like it's bigger.