I have a new Mobile Suites with 215/75R/17.5, G114 tires. Max psi for these is 125 and with 15k pounds on the axles (weighed), I keep them at 125. I also have a tire monitoring system to keep a check on them. I've only towed the trailer 3 times since I picked it up in November, and even in these cool temperatures, the psi increases on each to almost 150 on the highway. I'm concerned that in the summer, here in south Texas, that the psi will increase even more, due to highway heat. Just how much psi will these tires sustain? I've e-mailed this concern to GY with no response. Can anyone here offer any information?

Goodyear is fully aware of the tire pressure buildup that occurs when the tires reach operating temperature after a few hours on the road. The Goodyear G114s on our Mobile Suites typically run at 143-144 PSIG (120 PSIG cold inflation pressure) with no problems whatsoever after 2-3/4 years in service.Rusty

Thanks, Rusty. I see that you are also in Texas. The tires are rated at 4805 pounds at max psi. I have not had an opportunity to have individual tires weighed and am basing everything on the weight on the axle. At mid-7's on each, with a carrying capacity of 9610, I suppose that I could deflate down to about ~115~120, and that would have them at ~135~140 psi at highway temps. But that would be in cool weather, less than 80 degrees. What do yours average when Texas temps reach 105?

That is perfectly normal, that is why the manufacturers say to set your tire pressure cold (ambient temp) because they will heat up when rolling. The same is true on your tow vehicle also or any vehicle (even a car), we are just not aware of it without a TPMS telling us this. I live in S Louisiana & have pretty much the same temps you do and have not had a problem in 10 years of towing, but like you I still worry about it even thou deep down I know it is OK. :)

Know your tire weight. Use the inflation/weight chart and add 5psi to what the heaviest tire is. I run 125psi since my axle weights combined are 17,500#. I had the same tires on my 07.5 36SB3 MS and ran 110psi with even wear over thousands of miles and they ran cool.

Good replies. I've always been aware of my tire psi and temps, but my previous 16" tries did not increase so drastically.

Tire pressure on the road | Good Sam Community

clev
Explorer
Jan 20, 2017
Good replies. I've always been aware of my tire psi and temps, but my previous 16" tries did not increase so drastically.
Cummins12V98
Explorer III
Jan 20, 2017
Know your tire weight. Use the inflation/weight chart and add 5psi to what the heaviest tire is. I run 125psi since my axle weights combined are 17,500#. I had the same tires on my 07.5 36SB3 MS and ran 110psi with even wear over thousands of miles and they ran cool.
tvman44
Explorer
Jan 20, 2017
That is perfectly normal, that is why the manufacturers say to set your tire pressure cold (ambient temp) because they will heat up when rolling. The same is true on your tow vehicle also or any vehicle (even a car), we are just not aware of it without a TPMS telling us this. I live in S Louisiana & have pretty much the same temps you do and have not had a problem in 10 years of towing, but like you I still worry about it even thou deep down I know it is OK. :)
clev
Explorer
Jan 20, 2017
Thanks, Rusty. I see that you are also in Texas. The tires are rated at 4805 pounds at max psi. I have not had an opportunity to have individual tires weighed and am basing everything on the weight on the axle. At mid-7's on each, with a carrying capacity of 9610, I suppose that I could deflate down to about ~115~120, and that would have them at ~135~140 psi at highway temps. But that would be in cool weather, less than 80 degrees. What do yours average when Texas temps reach 105?
RustyJC
Explorer
Jan 20, 2017
Goodyear is fully aware of the tire pressure buildup that occurs when the tires reach operating temperature after a few hours on the road. The Goodyear G114s on our Mobile Suites typically run at 143-144 PSIG (120 PSIG cold inflation pressure) with no problems whatsoever after 2-3/4 years in service.

Rusty

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