I once got hold of the official European used formula for calculating tyrepressure for a load on tyre and system for speed used, and went running with it.

Now I use my own determined formula, and system for speed, to idea of an article of an american IR J.C.Daws.

I concuded in time that pressure advice is to give the tire a deflection for the speed, that wont overheat any part of tire when driving constantly the speed for wich the deflection is determined.

Can sent you the officiall formula and the link to mr Daws article , and more, if you mail me at my hotmail.com adress, with username jadatis ( combine yourselves, spamm-machines cant this way)

But I determined by reactions about bumping, that if real weight is 85% of weight the pressurevis calculated for for 99mph, that comfort and gripp is still acceptable. Verry subjective, and open for discussion. So I calculate for axleweight + 10% , wich makes if equally devided R/L, this load% , as I babtised it , to be 91%

Then if a little weight-difference R/L , lightest tire stays above 85% L%.

Can write a book about it, and call myself " pigheaded selfdeclared tirepressure-specialist" nowadays.