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It's the tyre USAGE that functionally determines the air pressure used, and that is WHY some vehicles, using exactly the same tyre, but having different weights, specify different air pressures on the door tags.
FWIW, one empirical equation is:
LBS ≈ 354.36*(PSI^0.4903); RR = 0.9995
where:
LBS = actual tyre load at PSI
PSI = tyre air pressure at actual load.
Remember, it's a functional combination of: vehicle weight, passenger & cargo weight, and performance (smooth ride vs. road holding) criteria.
Last edited by gone-ot; 03-19-2016 at 06:18 PM..
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