Originally Posted by Elite Washington
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.