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“Generally, as a radial tire revolves during operation, heat is generated on the inside of the tire at 4 degrees per minute. However, the tire loses heat at the rate of 3 degrees per minute with dissipation throughout the casing and airflow around the tire. After 40 minutes of continuous operation, the temperature has increased 40 Fahrenheit. As the temperature inside the tire increases, the inflation pressure also increases. Thus, a tire inflated to 80 psi cold would now be 85 psi. Because the inflation pressure has increased , the amount of tire flexing has decreased, which decreases the amount of heat generated per minute to 3 degrees per minute. Assuming the heat dissipation factor is still 3 degrees Fahrenheit per minute, the net temperature change is nil (0). This is called Thermal Equilibrium.”
I’m not a tire engineer. That quote came from the Michelin truck tire maintenance manual.
CW
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