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Originally Posted by horse7
Besides the tire carcass effects you mention, he would at least need to know the tire footprint in addition to PSI. PSI alone won't get there.
I've never investigated the effect, but offroaders use the PSI/tire footprint/vehicle weight concept, so it is probably effective to at least a first order approximation for auto tires.
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Actually, my thinking was that you don't need the tire pressure at all. If you know the footprint, the only other thing that you need is the weight of the tractor. The only reason I can see that tire pressure would come into play is that changing the tire pressure can change the footprint... but again, if you know the footprint, what does the pressure matter. And, for reasons I mentioned in my original post, There is more to how the foot print changes than JUST the PSI in the tires or the weight of the tractor.
John Mc