I came to this topic , googling for tire-pressure.
Once got hold of the formula that the tyre-makers in Europe use to calculate the needed pressure for a sertain load, and went running with it.
Made spreadsheets for it and translated a few from Dutch to English to go worldwide with it. Came to know by collecting information trough many fora, that this formula was not that holy as I declared it in the beginning, and Especially in America a wrong system is used , wich leads to to low pressures and so to much deflection of the tire for lower pressures.
Also on this topic, there is a link to such a wrong list.
If you see different load-letters in one list, you can sertainly say this list is wrong. I did not even checked it .
Other thing is that I calculate a high pressure wich leaves reserve for over/unequall loading, pressureloss in time, misreadings of load and pressure-scales, and what I forgot.
But if you go to high , comfort and gripp gets lost.
So for that I introduced the load% , wich is, what the real weight is of the weight you calculate the pressure for.
Under 85% L% discomfort begins by bouncing, under 80% screws come loose , so this can be used for trailers/caravans.
Over 100% tire-damage begins at the maximum speed of tire, or if lower 99m/h.
Here a link to my public map of skydrive, wich belongs to my hotmail-adress with the same username as here( so if you want to mail me combine yourselfes, spamm robots cant).
See if I can in my first post
H.Huester did some good weighing, so he can calculate with my spreadsheet , first for the first weighed axle-loads with front L% of 95% and behind L% of 85%. then see if it would have lead to to low pressures for the 4 point weighing he did later. Doing this you can yudge the savety of my calculations.
for this you can use the "pressurecalculationwithtemp"spreadsheet in the head-map somewhere in the middle.
To use it , first download it by rightclicking on it then choose for Download.
After download and eventual viruscheck, open it in Excell or compatible programm to use it ( open office Calc fi) , In the browser web app wont work, it caant handle sheet-protection and data-validation I used in most spreadsheets.
In the map "All about tire pressure" several "myownformula"spreadsheets. wich produce a list the same as the tire-makers give , and the different used systems are explained.