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Old 04-14-2015, 10:58 PM   #1
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Tire pressure built up over time sitting

I was preparing to travel tomorrow and in checking the tire pressures, I found they all went up It was in the morning when I was checking and the RV has been sitting for the last 5 months. Each tire was up around 120 psi, even the rears. I can assure everyone I have not filled them to that pressure in the past.

So I wound up lowering all the tires (110 psi in the fronts, 95 in the rears) based on my last weighing and am just curious, do tires increase in pressure like that over time (it's just south of Tampa).
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Old 04-14-2015, 11:02 PM   #2
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Not normally but if the temps were higher then yes it can happen but not usually that much.
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Old 04-14-2015, 11:06 PM   #3
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Maybe you need a new tire gauge.
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Old 04-14-2015, 11:09 PM   #4
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Quote:
Originally Posted by Stickdog View Post
Maybe you need a new tire gauge.
I was thinking the same thing.

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Old 04-14-2015, 11:09 PM   #5
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If you filled the tires on a cold day last fall, and checked them on a Warm spring morning they could read higher. Or it could be your tire gauge, Ive never seen one with a calibration sticker. I thought about that a lot during the NFL "Deflate gate" me being a former instrument calibration technician.
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Old 04-14-2015, 11:12 PM   #6
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Stickdog & jfran, you posted while I was still typing. LOL
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Old 04-14-2015, 11:24 PM   #7
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Quote:
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I was thinking the same thing.

Jon
Being I don't trust gauges, I checked them with two different ones. Both read much higher (the other one was even higher than 120 but I know that one normally reads higher). And these are not $10 gauges but then again, they're not $100 ones either.

And I did fill them in colder weather and it's been very warm here lately (high 80's).
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Old 04-15-2015, 03:02 AM   #8
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I understand that all tires where about 120 psi, and where filled 95 and 110.
then even if inaccurate reading there should be a difference .
could it be that the place where you stored it was not your own garage, and the owner for service filled tires ? Or else somewhere along the way at a tank station they once filled the tires standard to pressure given on sidewall, a service they think that normal that they did not mention it?

Slight chance that you measured it when driven so hotter inside tire temp.
then still the rear tires ( 95 psi) should have to low pressure so heat up more then front ( 110 psi) , because front then had right pressure so heated up less , and end pressure the same rear and front, because inside tire temp was higher in rear then front.
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Old 04-15-2015, 04:20 AM   #9
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80 degrees shouldn't cause a change like you're describing. Normally your tire pressure won't raise on its own until it's rolling down the hwy and building up heat.
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Old 04-15-2015, 10:05 PM   #10
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Quote:
Originally Posted by bokobird View Post
Being I don't trust gauges, I checked them with two different ones. Both read much higher (the other one was even higher than 120 but I know that one normally reads higher). And these are not $10 gauges but then again, they're not $100 ones either.

And I did fill them in colder weather and it's been very warm here lately (high 80's).
Tire Rack has a lot of information about proper care of tires. Check this out for temperature fluctuations: http://www.tirerack.com/tires/tirete....jsp?techid=73


Another thing that might have an affect on your tire pressure is altitude. Check this out: http://www.tirerack.com/tires/tirete...jsp?techid=167

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Old 04-15-2015, 10:18 PM   #11
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I bought a certified gauge at NAPA and only use it to verify the other gauges I own. I also have a Psiclops setup (http://www.popularmechanics.com/cars/a1875/4219068/) that allows two tires to be filled simultaneously plus a SmarTire system on the CC now. I also have a TST system I had on the Dutch Star. To say I watch the tire pressures is an understatement!
My Psiclops is an older model though but still works just fine.
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Old 04-15-2015, 10:37 PM   #12
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sure pressure changes... my tire pressure can vary up to 2-5 psi for just having one side of the RV face the sun while the other side stays cold. Its physics, pressure is proportional to temp.
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Old 04-16-2015, 10:02 AM   #13
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Quote:
Tire Rack has a lot of information about proper care of tires. Check this out for temperature fluctuations: http://www.tirerack.com/tires/tirete....jsp?techid=73
The psi change information in that article is not valid for large RV tires - it is based on typical passenger pressures. A tire changes its pressure a bit less than 2% for every 10 degree change in temperature, so an RV tire at approximately 100 psi changes about 2 psi up or down with a 10 degree up or down temperature change.

If you left the tires at 95 psi and came back to find them at 120 psi, either somebody added air or the temperature changed by 120+ degrees. Or the gauge used was horribly inaccurate.

Tires left alone lose air pressure rather than gain it.
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Old 04-16-2015, 11:28 AM   #14
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Heat varies PSI- get a decent gauge, so you can tell how much.
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