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The most increase of vollume will be in the lower pressure, when near to max pressure neclectable.
Once read from Michelin Energy saver ( P- tire) that they only expand 8%, and assumed this to be in vollume. So concluded the average tire to expand about 10%, when going from zero to pressure behind AT. Then for example from zero to 0.5 times AT 8% expantion in vollume, and from 50% to 100% the 2% rest expantion.
So in the pressure range tires are used, expantion is neclectable.
When descending from mountains, and using the brakes to often, the heat of brakes is transported trough the rimms to the air inside tire, and can heat it to boiling point of water so 212degrF.
With that the pressure rises and by that lesser deflection, so lesser heatproduction a cycle by driving. Also then speed is in the 30mh max so lesser cycles a second. This together gives lesser heatproduction a second, so rubber probably still wont reach the critical temp at wich it hardens so damages ( estimated it 300 degr F).
But then your high pressure and temp alarm will go of , so verry annoying when you have to concentrate on the curvy descending road.
But if you know now that its a " valse alarm" you can ignore it.
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