not true PJ....as i said i've had the training....and trust me tire technology is not a "close enough" field....i do indeed have a racing guage at the raceshop that reads on a 1/4psi scale...however its not necessary as the guage i used shows the same result over and over...the numbers are unimportant, the repitition is what counts... Dan stated the pressures would go up, they did not...if they do not register on a guage that reads infinitely even between the marked psi marks, then its not happening...
Key words "tire design"...this i am educated in...
sure i can agree with that and it is apples to oranges...a tire is *RUBBER* and it is supposed to stretch and flex...a cylinder is not...the piston makes the volume in the cylinder decrease, so the pressure *has* to go up....not so in a tire....a *properly* inflated tire(at the minimum side) will show no difference in the pressures when the weight it is designated to carry(at that psi) is placed on it.....
and i did state this....*initially* the pressure will go up when stepped on, while the skin stretches...the overall gain is nothing....as i stated not once, but several times....*I* am not the one in over my head here, i am fully aware of tire construction(anyone here ever seen a manufacturing plant and seen the stages a tire goes through? quite interesting...i not only had that in training, but later while installing machinery in our local yokohama plant(mitsubishi tire presses/autobookers/beadwinders).....) and have been properly trained...my "theories" are based on this training as well as experience, not "well if you think about it, it has to do....xxx...x...x...x..x"..... BS is BS and i called it....PJ try the "test' in your own driveway.... i did again today on my workvan...had the rear on jackstands and completely unloaded....(around 1000LBS of tools/equipment).....40psi in the tires...care to know what it reads *now* that it is fully loaded again and back on the ground?