Higher temperature of tires

Excerpt from the Michelin Tire Service Manual.

“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 air flow around the tire. After 40 minutes of continuous operation, the temperature has increased 40 degrees 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.”

FastEagle

The temperatures should be the same once you have driven down the road for 30 minutes. The recommended maximum PSI by the manufacturer is based on the temp of the air inside the tires being the same as the outside ambient air temperature. You are actually measuring the difference in air pressure inside and outside when you take a reading with a gauge.

The tires can take the extra heat and change in internal pressure better than they can take the heat for excessive flexing of the sidewalls if the tires are underinflated.

UPDATE: As we traveled today, we noticed that the higher temps were on the passenger side which is the opposite of yesterday's readings. So the SUN does make a difference!

Thanks for the tire information link. We have bookmarked that site.

I don't have a concrete answer. Our right inside dual runs warmer than the others. We cannot find anything wrong. Thinking maybe the crown of the road shifts more weight onto to the right side. The sun on one side will definately do it.

The TST systems are preset to alarm at 157 degrees to give you plenty of safety warning before the tire is damaged from heat.

Michelin states that their tires can go to 180 before damage begins.

I've also noticed about a 10 degree temp difference on the sun side.

Where do we find the heat rating for the tires? Bridgestone Duravis R250?
Thanks!

Thanks for your responses. This was just the second day for us to use the monitor. We will look up the heat rating for the tires. We were not aware that tires have heat ratings. We have the Bridgestone Duravis R250 (just one year old).

We were driving east today, so we did have morning sun on the driver's side. Also, our large slideout is on that side. We will check what we have in the storage area to see if we need to move some items... like the tookbox.

Starting tomorrow, we will arrive at our destination where we will stay for 2 months. In September, we will have a chance to observe the information again when we start traveling again.

Thanks again for your input.