Those with tire pressure monitoring systems..

Yes I towed with the E tires. They were the original tires, and I just felt they were at the upper limit of their capacity

If you went from E to G load , mind that the G load needs higher pressure for the same load then E-load.
yust by driving that 10% pressure-rising should be it so 13 on a 110 filled tire seems to much for me.

On the other hand the 110 psi tire has more maximum load so you would expect it not to need the full 110 psi.
Did you tow that heavy 5th wheeler also with the 80 psi tires ?
Otherwise that would be the explanation of the 110 rising 13 psi, the loads on tire have gotten much higher.

Thanks for all the replys everyone. I just went up to G rated from E rated and this is my first trip out. I went up 13 psi from a cold setting of 110 psi towing a 14000+lb 5th wheel

jadatis wrote:
I made a spreadsheet for it to calculate .
But going from the average of outside temp of 65 degr F and inside tire temperature when driving normally of 112 degr F the pressure will rise about 10% from cold ( 65 dgr) to warm ( 112 degr) .
This means that your 110psi wil get 121 psi ( about) and 80 cold will get 88 psi.

Motorhome pressure calculator map with pressurecalculationwithtemp spreadsheet

With given spreadsheet you can calculate it for every situation pretty accurate.
First download by RIGHT-CLICKINGand then choose DOWNLOAD , then after download to your computer and eventual virus-check , open in Excell programm on your computer, but Open office CALC can handle it to.

Very nice, thanks.
My in-laws come from Deventer, and it appears the fellow that owned my fifth wheel before came over from Holland, used it while living in Canada, then sold it and I assume returned home.
I forget what city he was from.
Bill

TomHaycraft wrote:
I don't have the experience with 80 or 110 psi, but at 55 and 65 psi, seems like I see a 5 to 8 psi increase and up to about 10 degree increase.

We have TST and with 80 PSI, see the same percentage of increase. Whatever the recommended PSI is COLD, the manufacturer allows for an increase when they are going down the road and warm up. It's safe.

10% pressure rise is about what I see. I set mine at about 76 psi (running less than rated load on the tires) and at highway speeds I see them rise to around 84 psi on average.

Besides from that about 10% pressure rising in normal conditions , the pressure can rise because of the temperature rising incidentially when braking to even boiling point of water ( 100dgr C /200degr F?).
Then the pressure can even rise 20% .
So when descenting in the mountains and using the brakes to often would give this 20% temp rising and your alarm set to 10% would still go of.
But this pressure rising is what the tire can stand.
Sertainly a pressure of 40% higher then the 80 or 110 the tire can stand. Mayby even 50 to 60% higher.
Also valves are given cold maximum pressure for 18 dgr C/65 degr F and are tested to can stand a higher pressure above that cold.
Mildest ( american) testing standard for normal valves is
Cold pressure ( 65 degr F) 65 to 70 psi depending on brand.
Then 26 psi extra for temperature rising , TR 600 HP series snap in rubber valves must have higher reserves but did not ask the valve importer for it.

So dont be afraid if pressure rises this way incidetially and thats the reason why most TMPS are set to 20% higher then cold pressure before alarm.

With this pressure rising the tire gets lesser deflection so lesser bending of the rubber so lesser heat production at that moment .
This makes that the rubber of tires probably still stays below a temperature where it hardens wich would cource damage to those spots at following bendings/ deflections of tire.
So at moments when the cooling of the rubber is worse lesser energy is produced .

I set mine for 88PSI on my 80 PSI tires. :)

TomHaycraft wrote:
I don't have the experience with 80 or 110 psi, but at 55 and 65 psi, seems like I see a 5 to 8 psi increase and up to about 10 degree increase.

You are up early I see with 3 a clock in the night in America
I write from Holland Europe where its now 11.54 in the morning .

But the 10 degree increase is probably not right measured by your TMPS.
Especially when the sensor is schrewed on the valve it gives a temp between inside and outside temp.
A 5 to 8 psi increase on 110 psi tire means about 5 to 8% pressure rising wich would happen at about 25 degr F temperature rising so not 10 degr.

And @ Edadlanta
Do you also notice that about 47 degrees Fahrenheit temperature rising?
I converted the Fahrenheit from Celcius so 18 degr C= 65 degr F and 45 degr C = 112 degr F .

I have seen just about the same as jadatis reported above. I had 80 psi tires on my 5'er and changed to 110 psi with the current set so I have experience with both E and G rated tires on the same rig.