Recently, I had 4 E rated Goodyear Endurance tires mounted on my 5th Wheel to replace the less than stellar Castle Rock Chinese tires that were on my camper originally. My EEZ TPMS showed Three tires to be at 77 PSI and One tire to be at 78 PSI when I left on my recent camping trip. I noticed that after about 15 minutes at highway speed (65mph) the PSI increased 10 PSI in the Three tires so they were at 87 PSI and 12 PSI in the fourth tire to make it 90 PSI. The tires only increased in temperature 6 degrees in that time span. The PSI and temperature readings remained at these levels for the duration of my 3.5 hour trip. Does anyone know if running the tires at these PSI levels is safe or should I back down the cold PSI a little so they don't go too far over the 80 PSI cold maximum marked on the tires?

From whatever I have ever read or heard concerning tire inflation is to always air tires cold, any deviation in psi due to temp or mph there after has been accounted for by tire manufacturing engineers. I keep my ST tires at or very near to max inflation as stated on sidewall, passenger and truck tires inflated to door pillar label recommendations.

Pressure increase when running is normal. If anything you could go 2-3 psi higher as the COLD inflation was below 80 psi. Cold is before you roll and before the sun warms them up.

TPMS = one more thing for people to fret about that they never knew was happening before. As evidenced by the stark realization in recent threads that tire pressures change ALOT with temperature (ambient, road and internal) and altitude.

If you have sensors on the valve stems, and are going by their readings, you only know the temperature of the stems. While they report changes, the actual temperature inside the tire can be much higher.

I assume you up sized in load range. Weigh your rig. Use load/inflation chart for your tire and add 5psi. This is per GY Tech Support.

Goodyear Endurance Tire Pressure | Good Sam Community

RobWNY
Explorer
May 28, 2019
Thanks everyone. The Tire place where I had them mounted and installed put the air in them. their gauge and my TPMS must be off by a couple of pounds. I didn't have time to get them exactly at 80 PSI per the sensors before I left on my weekend camping trip. I feel fortunate that I got ready enough to go at all. Long story! Anyway, my alarm is set for high pressure to go off at 96 PSI (80 + 20%) and Low pressure is set to 72 PSI (80 - 10%) So if normal "hot" pressure is about 90 PSI for me, should I set my TPMS High Pressure alarm to 20% above that or leave it where I have it?
ktmrfs
Explorer II
May 28, 2019
Boyles Law PV=rT. for a constant volume (which a tire basically is) Pressure increases linearly with temperature. But remember T for room temperature is NOT 73F or 23C, it is about 273K. So a 10% increase in temperature is about 30C.

And tire mfg specify COLD tire pressure. they already have accounted for temperature change effects on the tire.
Cummins12V98
Explorer III
May 28, 2019
I assume you up sized in load range. Weigh your rig. Use load/inflation chart for your tire and add 5psi. This is per GY Tech Support.
Lynnmor
Explorer
May 28, 2019
If you have sensors on the valve stems, and are going by their readings, you only know the temperature of the stems. While they report changes, the actual temperature inside the tire can be much higher.
Grit_dog
Navigator
May 28, 2019
TPMS = one more thing for people to fret about that they never knew was happening before.
As evidenced by the stark realization in recent threads that tire pressures change ALOT with temperature (ambient, road and internal) and altitude.
time2roll
Nomad
May 28, 2019
Pressure increase when running is normal. If anything you could go 2-3 psi higher as the COLD inflation was below 80 psi. Cold is before you roll and before the sun warms them up.
Sandia_Man
Explorer II
May 28, 2019
From whatever I have ever read or heard concerning tire inflation is to always air tires cold, any deviation in psi due to temp or mph there after has been accounted for by tire manufacturing engineers. I keep my ST tires at or very near to max inflation as stated on sidewall, passenger and truck tires inflated to door pillar label recommendations.

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