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Old 01-13-2025, 08:26 AM   #1
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Tire PSI again, sorry

I have read many posts about tire pressures and didn't see the actual answer I need. I know the consensus is to air to the cold pressure on the tires. Mine is 125psi cold. So during the day the pressure rises. At what point should I start to worry about too much pressure? I am aware they are built to compensate for higher pressures. But how much?

Thanks in advance,
Dave
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Old 01-13-2025, 08:50 AM   #2
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There isn't actually consensus as to proper tire pressure but whatever you choose, the increasing heat of the day will not matter.
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Old 01-13-2025, 08:53 AM   #3
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On our rig, the tire cold pressure is 110. I am not concerned with the high tire pressure during travel days. I have seen the PSI go to over 122 on our tires.

Here is the quick start for the TST507:
https://tsttruck.com/media/productsu...507-QI-_B_.pdf

Look at page 2, it says set high pressure to 20%, so figuring that I would not be concerned until that point.
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Old 01-13-2025, 09:02 AM   #4
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Airing up cold is not a consensus,, it's the absolute correct time to check and air up tires. You are right that tires are built to compensate for pressures higher than what the sidewall states. The tires will be fine if aired up cold, before driving, and before the hot sun hits them.

It's a good idea to check and adjust before taking off each morning, especially if the previous air up was done when outside temps were a lot lower or higher than the morning before. For example, aired up at 0°F temperature on day one and then waking up to an 80°F the next morning.
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Old 01-13-2025, 09:06 AM   #5
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No one can give an exact number, as to how much over cold sidewall sidewall pressure, before blow out, or tire/rim separation.

However a TE on another forum, explained that the tire is capable of WAY more than sidewall psi indicated. More than any daytime extreme heat will ever come close to exceeding. Now if your tire is WAY underinflated for whatever reason, it can cause extreme heat buildup, leading to blowout.

The tire max rating on sidewall is for weight carrying max at that psi, not max psi for the tire.
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Old 01-13-2025, 09:36 AM   #6
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Thank you for the replies. Sorry I used the wrong wording.
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Old 01-13-2025, 09:37 AM   #7
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My method. First, I have weighed the RV so I know the weights/loads.

I inflate/deflate the tires in the morning before travelling to 5 lbs over the tire chart weight. During stops, along the way, I use my IR thermometer to check all the tire temps. This is easy to do and takes about 2 minutes for both the RV and Toad. If any one tire is more than 10% above the others, there's an issue (brake dragging or under inflated tire). Now that I have all metal valve stems, I'll invest in a TPMS.

Why do I check before leaving? - Outside temps matter. We camp year round, the temps can change considerably from day to day.

I don't understand the folks who say "I check it once at the beginning of the season"
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Old 01-13-2025, 11:50 AM   #8
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Quote:
Originally Posted by SafeDave View Post
At what point should I start to worry about too much pressure? I am aware they are built to compensate for higher pressures. But how much?

You can start to worry at whatever temperature you choose. It is the temperature of the tire that is what you're worrying about, and that is what's causing the higher pressure.



If you feel the pressure/temp is too high for your comfort, slow down, or pull over and rest. Under no circumstances do you release air from the tires as a result of pressure climbing while driving.
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Old 01-13-2025, 02:49 PM   #9
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These tire PSI threads...OMG...TMI
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Old 01-14-2025, 09:44 AM   #10
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Quote:
Originally Posted by SafeDave View Post
I have read many posts about tire pressures and didn't see the actual answer I need. I know the consensus is to air to the cold pressure on the tires. Mine is 125psi cold. So during the day the pressure rises. At what point should I start to worry about too much pressure? I am aware they are built to compensate for higher pressures. But how much?

Thanks in advance,
Dave
Let me ask you a question?

Do you readjust your truck/car's tire air pressure after driving on a hot day and the tire air pressure has expanded due to heat?

I don't nor do I readjust the trailers air pressure when under way.
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Old 01-14-2025, 10:37 AM   #11
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People worry about the pressures on their rvs, do they do the same on their cars? Do they check their car tires every morning before heading to work?
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Old 01-14-2025, 10:46 AM   #12
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No I don't check my car every day (Normally every month) but the comparison is invalid in my opinion

My car weighs 3200 lbs not 11,000 and up.
Damage to my car from a blowout is minimal
My car has a spare
My car is easily towed
My car is rarely driven thousands of miles from home
A blowout in my car wont have an impact on a months long trip.
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Old 01-14-2025, 10:56 AM   #13
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It was a rhetorical question, sorry.
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Old 01-14-2025, 07:01 PM   #14
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Quote:
Originally Posted by SafeDave View Post
I have read many posts about tire pressures and didn't see the actual answer I need. I know the consensus is to air to the cold pressure on the tires. Mine is 125psi cold. So during the day the pressure rises. At what point should I start to worry about too much pressure? I am aware they are built to compensate for higher pressures. But how much?

Thanks in advance,
Dave
Valid question.....however only the tire mfg would have the data for that particular tire as to how much pressure the tire can stand before the tire comes apart (delamination/belt separation/etc). Give them a 1-800 or text mes.
Some rv trailer owner over tire their trailers such as a load G in place of a load E then derate the tire to a low psi. On a heavy trailer this can and has caused tires to run hot. Plus it balloons the tires sidewall with a localized flex point/ sidewall cuts from curbs/potholes/objects in the road
BTDT....but something expensive I and others learned the hard way when pulling non rv trailer for a living 52 weeks a year full time.
Give the mfg a call.
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