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Old 01-03-2023, 04:40 PM   #1
JOglesby
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Yet another tire pressure question.

I've read so many posts about tire pressure but can't seem to find the answer.

SO here it goes. I currently have ST205 75R14 load rating D tires on my Keystone Bullet. The sticker on the camper and the markings on the tires say 65 PSI, max 65PSI cold. This is where I start. I am religious about checking the pressure before I tow. We also have a TPMS. My question is, assuming the trailer is fully loaded (7,600 pounds) and I have inflated to 65 psi when cold, what pressure should I be worried about while towing and they have heated up?

I see a pretty rapid rise to 69 PSI within the first 10 miles or so. I have my TPMS set to warn me at 77 PSI, is this to high?
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Old 01-03-2023, 07:47 PM   #2
travelin texans
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Inflate to 65, or whatever sidewall states, cold & go. The tire manufacturers have calculated that the pressure will increase with rise in temps & have allowances built into the tires. Otherwise there would be warnings about inflating to max cold if temps exceeded XXX temperature.
I'd recommend using a good quality TPMS that have temp & pressure readings & watch for the tire that seems to be excessively hot or high in pressure from the others, not that there's a definite temp or pressure to watchful of.
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Old 01-03-2023, 07:50 PM   #3
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Quote:
Originally Posted by JOglesby View Post
I've read so many posts about tire pressure but can't seem to find the answer.

SO here it goes. I currently have ST205 75R14 load rating D tires on my Keystone Bullet. The sticker on the camper and the markings on the tires say 65 PSI, max 65PSI cold. This is where I start. I am religious about checking the pressure before I tow. We also have a TPMS. My question is, assuming the trailer is fully loaded (7,600 pounds) and I have inflated to 65 psi when cold, what pressure should I be worried about while towing and they have heated up?

I see a pretty rapid rise to 69 PSI within the first 10 miles or so. I have my TPMS set to warn me at 77 PSI, is this to high?
Our TST 507 system said it was pre-set at 158 degrees for the high temp alarm, so that is where I left it. I set the high pressure alarm at least 30 psi higher than the cold pressure setting, because you will get at least a 20 or more psi rise when on dark pavement and the tires are on the sunny side while traveling. I set the low pressure alarm at 10 psi below the cold pressure setting, because any lower with continued use and the tires are essentially trash.
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Old 01-03-2023, 08:01 PM   #4
sourdough
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I've never changed the high temp setting on my TST 507 from factory which is like the previous post. A trailer tire inflated properly to 65psi as the sidewall indicates will die from a lot of things but getting too hot and failing would be close to the bottom of the list.
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