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Old 11-03-2018, 04:10 PM   #1
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Losing Tire Pressure

I always check the tire pressures before leaving on a trip as I suppose many RV’rs do. Our last trip was about 6 weeks ago and the temps were in the 80’s/90’s, but in the low 70’s when I checked the cold pressures.
When I checked the pressures today, all 6 tires were down 5 to 6 lbs. Today’s temps were only in the 60’s.
I inflated all tires to the recommended pressures and checked for leaks around the valve stems.
I find a 5-6 lb pressure loss on all 6 tires odd. I wouldn’t think that a 10 - 15 drop in ambient pressure would cause this.
Has anyone else experienced something like this?
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Old 11-03-2018, 04:14 PM   #2
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Its done it to my car twice.

When the 65° weather came to NY all of the tires needed a few pounds, according to the TPMS.

I got to MD with 45° and they were all low again. I towed it to S.C. and all is well again.
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Old 11-03-2018, 04:19 PM   #3
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That is not unusual on large tires. I have a TPMS and occasionally get a low pressure alarm on cold mornings.... and that would happen more likely when I inflated to the spec on a warm evening a week or so earlier.
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Old 11-03-2018, 04:33 PM   #4
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The pressure of a gas of fixed mass and fixed volume is directly proportional to the gas's absolute temperature. Gay-Lussa's Law of gases
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Old 11-03-2018, 08:51 PM   #5
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This is yet another fallacy of running the tire inflation/load pressure (it is the minimum allowed for the load) listed, you leave no room for temperature or elevation deviations.
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Old 11-03-2018, 10:30 PM   #6
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and further, just dropping 10-PSI (from 80 to 70) on a dually rear axle drops axle capacity by 1,000# (+/-) (Check your charts to verify)
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Old 11-03-2018, 11:09 PM   #7
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It sounds normal to me. If they were all showing the exact same psi, then what you're describing is nothing to worry about. If just one were off, then I'd be concerned with that particular tire.
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Old 11-04-2018, 12:02 AM   #8
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most likely aggravated by moisture in the inflation air
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Old 11-04-2018, 07:02 PM   #9
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Your tires lose or gain roughly 2% of their pressure for every 10 degrees (F) down or up, so a tire at 100 psi checked at 90 F. will read about 96 at 70 F.


You said you checked the cold pressure when it was "low 70's" and again in the 60's, so not very much drop in temperature. Maybe 10 degrees tops. That sounds more like a leak than a temperature variation effect.
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Old 11-05-2018, 02:19 AM   #10
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Quote:
Originally Posted by VanDiemen23 View Post
most likely aggravated by moisture in the inflation air
Does that mean that it is time to change to a winter blend air?








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Old 11-05-2018, 07:30 AM   #11
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I always change the seasonal air blend when we switch to/from daylight savings time here in Arizona.
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Old 11-05-2018, 08:15 AM   #12
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Does that mean that it is time to change to a winter blend air?
Yes, only use dry air. The vast majority of air compressors do not have an inline moisture trap.
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Old 11-05-2018, 08:20 AM   #13
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Originally Posted by FatChance View Post
I always change the seasonal air blend when we switch to/from daylight savings time here in Arizona.
I change the winter air out on the first day of fall and then change back to summer air on the first day of spring. Just like changing the oil and filter every 1000 miles, it makes it easy for me to remember when to perform these important preventative maintenance procedures.


LandKO, you did use the same device (air gauge, TPMS) at both readings, right? I figure you did but thought I'd ask. Five psi seems a bit much but since it's on all the tires, it's probably just one of those flukes and is ok. Keep an eye on them to be sure...
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Old 11-05-2018, 08:22 AM   #14
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Nitrogen is very dry.
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