Well.... interesting observation made today. After my last tire failure, I had quite a bit of damage in the fender well. We took the coach to Camping World today (about 60 miles from home) for an estimate for insurance purposes. When we returned home from teh last trip on which we had the failure, I purchased a laser thermometer to be able to check the tire temps in the future. So today, when we stopped at Camping World, I immediately checked the tire temps for reference. Currently, I have 5 Goodyear G647 19.5s and 1 Bridgestone 19.5 on the driver side outside dually coupled with the Goodyear. The Bridgestone was the only tire that had to replace my failed one on the roadside. The temps on all the Goodyears were around 110 degrees on arrival (give or take 3 degrees), but the one Bridgestone was only reading about 95 degrees.So what gives? Why was the Bridgestone cooler than the rest? And what is considered an acceptable temp? All temps were read at the rear of the tire on the tread surface. I have in my possession a TST TPMS, but have not installed it yet.

First question would be whether you have measured the effective rolling diameter of the inner (Goodyear) vs outer (Bridgestone). If the inner tire is larger, therefore carrying more of the load it will be warmer.Also, inner tires, because of less air circulation DO run warmer than outers.The answer as to "how hot" they can get-- tire engineers I have read suggest this is really not an issue-- even 140 not being excessive. Sure, will accelerate wear, but not dangerous. Their basic answer is to run the correct PSI (checked cold) and don't worry about temperature.

I would guess that a newer tire, with more tread and softer rubber, would shed heat better than an older tire with less tread and hardened rubber.

All of the Goodyears were basically the same temp (within 3 degrees of each other including inner and outer on the passenger side as well as on the front) while the one Bridgestone was 10 degrees cooler. I can see your point if the Goodyear mounted beside it was carrying most of the load. For reference, ALL tires were inflated today to 100PSI before we left. Sidewall Max cold rating for the Goodyears and the Bridgestone is 110. There is less than 500 miles difference in the tread wear.

Different side wall thicknesses, belt construction, tread construction, road friction, tread thickness and other variables come into play. All of your tires were well within specification limits, so I wouldn't be concerned. Have you considered purchasing a TPMS system so you can keep an eye on temperature and pressure while you're heading down the road?

10forty2 wrote:All of the Goodyears were basically the same temp (within 3 degrees of each other including inner and outer on the passenger side as well as on the front) while the one Bridgestone was 10 degrees cooler. I can see your point if the Goodyear mounted beside it was carrying most of the load. For reference, ALL tires were inflated today to 100PSI before we left. Sidewall Max cold rating for the Goodyears and the Bridgestone is 110. There is less than 500 miles difference in the tread wear.Are all of the tires the same load rating, like F, G, or H? Since you said that the Brigestone could be inflated to 110 psi it might have a higher load rating.

Tire Temperatures | Good Sam Community

15 Replies

rgatijnet1
Explorer III
Jan 19, 2015
10forty2 wrote:
All of the Goodyears were basically the same temp (within 3 degrees of each other including inner and outer on the passenger side as well as on the front) while the one Bridgestone was 10 degrees cooler. I can see your point if the Goodyear mounted beside it was carrying most of the load.

For reference, ALL tires were inflated today to 100PSI before we left. Sidewall Max cold rating for the Goodyears and the Bridgestone is 110. There is less than 500 miles difference in the tread wear.

Are all of the tires the same load rating, like F, G, or H? Since you said that the Brigestone could be inflated to 110 psi it might have a higher load rating.
TucsonJim
Explorer II
Jan 19, 2015
Different side wall thicknesses, belt construction, tread construction, road friction, tread thickness and other variables come into play. All of your tires were well within specification limits, so I wouldn't be concerned.

Have you considered purchasing a TPMS system so you can keep an eye on temperature and pressure while you're heading down the road?
10forty2
Explorer
Jan 19, 2015
All of the Goodyears were basically the same temp (within 3 degrees of each other including inner and outer on the passenger side as well as on the front) while the one Bridgestone was 10 degrees cooler. I can see your point if the Goodyear mounted beside it was carrying most of the load.

For reference, ALL tires were inflated today to 100PSI before we left. Sidewall Max cold rating for the Goodyears and the Bridgestone is 110. There is less than 500 miles difference in the tread wear.
rgatijnet1
Explorer III
Jan 19, 2015
I would guess that a newer tire, with more tread and softer rubber, would shed heat better than an older tire with less tread and hardened rubber.
wolfe10
Explorer
Jan 19, 2015
First question would be whether you have measured the effective rolling diameter of the inner (Goodyear) vs outer (Bridgestone). If the inner tire is larger, therefore carrying more of the load it will be warmer.

Also, inner tires, because of less air circulation DO run warmer than outers.

The answer as to "how hot" they can get-- tire engineers I have read suggest this is really not an issue-- even 140 not being excessive. Sure, will accelerate wear, but not dangerous. Their basic answer is to run the correct PSI (checked cold) and don't worry about temperature.

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Tire Temperatures

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