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Old 05-14-2016, 07:08 PM   #11
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Just aired mine up to 51, so I don't disturb others with my compresser in the morning. Temps supposed to go down 7 more degrees tonight, so should be good in morning.
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Old 05-14-2016, 08:01 PM   #12
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I keep my pressure at 50 psi at ambient temperature. I check it early in the morning before the sun rises and set the pressure accordingly.
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Old 05-14-2016, 08:20 PM   #13
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I noticed when I was running nitrogen the pressure did not climb much in the tires. I run good ole free air like most people and when the temperature goes up the air pressure in the tires go up. I have a TST 507 TPMS


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Old 05-17-2016, 09:50 AM   #14
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I adjust for temperature when I inflate my tires. I make the assumption that the pressure recommendations are for around 70 degrees. If it is above or below, I adjust the pressure accordingly. I usually am only a few lbs in either direction so I think I am safe but who knows.

Winter Tech Information - Air Pressure, Temperature Fluctuations
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Old 05-19-2016, 04:34 PM   #15
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Quote:
Originally Posted by tahoe1840 View Post
I asked a local tire guy the same question and he replyed that as soon as you drive about 5 miles the road friction on the tires causes heat bringing your tires right back to pressure. Not a bad idea to drive it and then check the pressure too.
You really need a new "tire guy" Just because someone sells and mounts tires does not make them really knowledgeable. Would you get medical advice from the cash register clerk at the local CVS? They sell a lot of band-aids.

1. It is NOT road friction that heats a tire but brnding of the rubber in the tire structure.
2. It is possible to over stretch portions of a tire as soon as it rolls one revolution. This means that microscopic cracks may be initiated.
3. Once there are cracks in the tire structure, they will NEVER heal. They will just grow till they are too large so the tire fails.
4. I have seen a set of HI-Perf passenger tires ($250 per tire) fail in 5 miles from being gun under improper conditions.

Tires need to be properly inflated with enough air to support the actual load on each tire starting at revolution #1. Inflation pressure should be checked before the tire has been driven more than 1 mile and after it has been allowed to cool to ambient (about 2 to 3 hours after being driven and not after being warmed in the Sun.
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Old 05-19-2016, 04:41 PM   #16
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Quote:
Originally Posted by gmacklem View Post
I adjust for temperature when I inflate my tires. I make the assumption that the pressure recommendations are for around 70 degrees. If it is above or below, I adjust the pressure accordingly. I usually am only a few lbs in either direction so I think I am safe but who knows.

Winter Tech Information - Air Pressure, Temperature Fluctuations


WRONG assumption.
Pressure recommendations for Motorhomes are based on tire loading. For trailers you should run the pressure associated with the Max Load as molded on the tire sidewall. ALL pressures are based on the tire being at AMBIENT temperature.

FYI I am responsible for Tire Rack correcting their statement on pressure change per 10įF. They use to say 1 psi as they were only thinking of standard passenger tires before I pointed out their error.
Here is the math if you don't want just my word.
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Old 05-20-2016, 11:57 AM   #17
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I set pressure in the cool morning.
I have set "cold" tires in the middle of a hot afternoon and by peak day temp they are up 5lbs more
Now we drive and those pressures are way up!
I know the tires can prob handle the pressure but after two blowouts,I'm cautious.


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Old 05-20-2016, 05:34 PM   #18
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Originally Posted by trdutch View Post
I set pressure in the cool morning.
I have set "cold" tires in the middle of a hot afternoon and by peak day temp they are up 5lbs more
Now we drive and those pressures are way up!
I know the tires can prob handle the pressure but after two blowouts,I'm cautious.


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"Blowouts" are the result of running low pressure such that the sidewall flexes too much and the heat generated actually melts the Polyester body cord. You can see examples in the tire autopsy posts on my blog.

TT should use the tire sidewall pressure as the cold set pressure. Motorhomes need to know the minimum inflation needed to support that actual measured load on the heavier end of each axle as listed in published Load & inflation tables. I suggest +10% from that for the cold set pressure. This has been covered numerous times in posts on my tire blog.
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Old 05-20-2016, 05:52 PM   #19
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man some people like to make the smallest things into big ordeals . tire pressure is very important no question there . but simply pressurizing in the AM to the rated psi is enough . weather it's 30 or 60 out in the am i set my tire pressure to max load of 80 psi . after driving some good hwy miles it does no good to check the pressure again unless a tire is looking low and you suspect a leak .don't be surprised if that now warm tire shows a much higher reading that's normal .
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Old 05-20-2016, 09:12 PM   #20
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I'd suspect tires can handle over inflation much better than under and the results of under inflation can be catastrophic. So therefore, to put my 2 cent in on the original question, I'd set my tire pressure after the 20 degree drop in temp. in the morning. I agree, this will drive you crazy trying to figure out what the right pressure is at times.
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