In this article of an American J.C.Daws , he explaines a new way of calculating, and compares it to the old power-formula and its diferent used powers in America and Europe. A stiffer tire in his formula ( G-load stiffer then E-load ), has a smaller construction load ( my word for the load that is bare at zero pressure) then a less stiffer tire .
So in his calculation a stiffer tire needs a higher pressure for the same load then a less stiff tire.
So there are 2 things that are wrong, first is the power used in America of 0,7 , while in Europe it is 0,8 , and he even advices 0,9 to 0,95 for for tires with high maxloadpressure ( referencepressure). Second is that every maxload/referencepressure combination needs a seperate calculation.
Hover over this article and search for the conclusions and the endconclusion.
The first formulas I dont understand too.
I even concluded my own formula , wich is a combination of the "Daws"formula and the old Power-formula, and use that now in my spreadsheets.
You can also read my article about it, in wich I compare the different calculations , but I admit that I am not an authority in this field, Yust got interested in it and searched it out. But if you read it , and use your own technical intuition , you will come to the same conclusion.
My article "proveofwrongcalculation"can be found in the "all about tire pressure"map on my skydrive. wich I made to support my mail-discussion with Mr. Daws.
you see that my tire-pressure interest has gotten a bit out of hand, but I discovered much more about tiresload and pressure, there is more wrong in the tire-business. But one thing at the time.
First this use of lists that lead to tire damage out of the world.