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Old 05-11-2021, 12:23 PM   #21
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Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
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Originally Posted by Elite Washington View Post
Just curious for those that have 225/75/16 and start off at cold pressures of 80psi what would be the max operating pressure you would see on a summer day?
Max actual tire pressures are the rating on the side of the tire say 110 psi plus the tire pressure increase from 80 degrees to 180 F degrees or 22 psi . So the max acceptable pressure would be about 132 psi when the tire temperature is 180 degrees. Never let air pressure out of a hot tire you have have increases the altitude of your vehicle 5000 ft or more.
It is the air pressure in the tire (actually the number of air molecules) that holds the vehicle up. The more pressure the heavier load the tire can carry. The more air in the tire the cooler the tire will run. The faster you drive the hotter the tire will run. For instance. I increased the air pressure in my rear tires from 82 psi (recommended) to 88 psi and it dropped the pressure gain from 24 psi to 18 psi. The normal operating pressure in the rear tires is 106 on the outside and 109 on the inside on a 100 degree day. I run 76 psi in the fronts and the pressure gain is 14 psi or 100 psi total pressure on a 100 degree day.

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2016 Hurricane 31S
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Old 05-12-2021, 04:38 AM   #22
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Brand: Thor Motor Coach
State: Washington
Posts: 675
THOR #6433
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Originally Posted by Beau388 View Post
Max actual tire pressures are the rating on the side of the tire say 110 psi plus the tire pressure increase from 80 degrees to 180 F degrees or 22 psi . So the max acceptable pressure would be about 132 psi when the tire temperature is 180 degrees. Never let air pressure out of a hot tire you have have increases the altitude of your vehicle 5000 ft or more.
It is the air pressure in the tire (actually the number of air molecules) that holds the vehicle up. The more pressure the heavier load the tire can carry. The more air in the tire the cooler the tire will run. The faster you drive the hotter the tire will run. For instance. I increased the air pressure in my rear tires from 82 psi (recommended) to 88 psi and it dropped the pressure gain from 24 psi to 18 psi. The normal operating pressure in the rear tires is 106 on the outside and 109 on the inside on a 100 degree day. I run 76 psi in the fronts and the pressure gain is 14 psi or 100 psi total pressure on a 100 degree day.
Okay so really itís the temps that are more to watch because the pressure will increase accordingly?
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Old 05-12-2021, 01:32 PM   #23
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Originally Posted by Elite Washington View Post
Okay so really itís the temps that are more to watch because the pressure will increase accordingly?
Low pressure is the primary purpose of a TPMS

High temperatures are from over loading or low pressure or a combination, and could be other issues involved such as alignment and so on

Tires fail from high temperatures or road hazards
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Old 05-13-2021, 12:16 AM   #24
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Brand: Thor Motor Coach
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State: Texas
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Originally Posted by Elite Washington View Post
Okay so really itís the temps that are more to watch because the pressure will increase accordingly?
It is the tire flex that generates the heat. It is called hysteresis; remember, the tire is flat on the bottom. The more air you put in the tire the less the flex, so less heat. The tire company tests their tire and the heat gain at different tire pressures and come up at a load/pressure diagram that ensures the tire does not overheat and loose structural integrity. It is the heat that destroys the tire and not the tire pressure, but the lack of sufficient tire pressure that causes the tire to overheat and subsequently fail.
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