Tire pressure, question on increase.

Rule of Thumb:

There should be no more than a 10 percent increase in pressure.

Since you've got 12 percent, that's just a bit too much. You should seriously consider using more inflation pressure - or a larger size tire - somehow raise the load carrying capacity. Or you could slow down.

Please note: 10 percent is not a target. It is a max.

Looks like I am good. Thanks.

Totally normal.
My tires increase as much as 11 PSI (65 to 76) and I haven't even had them anyplace hot yet.

When I am towing my 5th wheel the rear tires on my truck experience the greatest tire pressure change. They are also the tires loaded closest to the tire rating.

I get about a 12.5% change in pressure after 50 miles or so of towing.

I have the TST system and have found the tire temperature totally useless.

As per Goodyear tire pressure will change about 2 psi per 10 degrees F.

Thus when my tire goes from 80 psi to 90 psi then the tire temperature should increase by about 50 degrees F.

My TST system does not even come close to that. Typically it indicates about 10 to 15 degrees F above ambient.

The TST does not have any air exchange with the tire and is being cooled by a 60 mph ambient wind.

After 50 miles of towing I find my pressures on a given axle are typically within 2 psi provided they were the same when checked cold without any sunshine exposure.

I have found no noticeable change in pressure with the tires in the sun while I am going 60 mph down the road.

Tires do get warmer and increase pressure while driving. This is completely normal.

As long as your tires are properly inflated when cold, don't worry about what temperature and pressure they are while driving.

I think these new vehicles have way too many unnecessary electronic gadgets on them.

Yea, I was going to come back and say that we're using the TPMS tire monitoring system that gives us real time pressure and temperature readings by tire.

Winged One wrote:
14,500 lb loaded trailer,

Around 11,200 on 4 tires (7,000 lb axles).

Goodyear G614 tires, about 3 years, 7000 miles on them.

Ambient temperature: 78 degrees. After running 1 hour on mixed highway (63 mph) and two lane (56 mph), trailer tires temp at 86 degrees.

Pressure increase from cold by around 12 percent. All tires within 1 degree of each other and within 2 psi of each other after 1 hour.

Normal?

How are you measuring the tire temperature?

We load our G614 to 110 psi cold. I find our temperature usually is warmer while traveling on the sun side of the trailer, sometimes as much as 6-12 degrees. The psi will climb to 120 +psi especially on the sun side running all day long. What you're describing sounds normal.