Tire manufacturers state tire pressure should always be measured when cold. If you ever need to add air when tires are warm or hot; the manufactures say not to exceed the maximum pressure (this means you will need to add more when they cool off, but ensures you do not exceed the rated pressure).
It is normal that the pressure in a properly inflated tire, when cold, will exceed that manufacture rated maximum when the tire is hot; this is normal and is factored in when they determine the maximum cold tire air pressure.
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