It's not so much the weight on a tire that will effect the pressure, it's displacement, or the reduction of volume inside the tire that would.
But the tire is built with that in mind, and the pressure you normally fill them to keeps them from getting too deformed with added weight, so any change in internal volume (and therefore pressure) is minimal.
It's kind of like a tube of tooth paste. You can squish it, but the volume stays the same because you're only distorting it - not actually compressing it. You move the toothpaste from one area to another.
A tire may get flatter, but it also gets wider so the internal volume pretty much stays the same. The tire wall itself feels and supports the load.
In older tires, you might start getting lots of stress cracks especially in the sidewalls.
Since the tire distorts at the bottom against the ground, it can open these cracks. Tiny amounts of air leaking out adds up over time.
but the real reason to keep your tires up off the ground is not just to avoid opening those stress cracks - but to avoid getting them in the first place.
They form from the rubber flexing - leaving a tire sitting in on spot with the same area under stress for a long time will eventually deteriorate the rubber into cracks.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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