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Old 01-06-2019, 11:14 AM   #1
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Tire pressure when the temperature changes 50 degrees

In the Denver area the temperature can change 50 degrees in the same day, so what should you set your tire pressure?

I've read posts where folks are traveling and they adjust their tire pressure as they travel to new locations with significantly different temperatures, but what should you do when you're in the same geographic area and the temperature changes so drastically in a matter of hours?
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Old 01-06-2019, 11:37 AM   #2
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Always set the tire pressure cold ; before the RV is driven for the day ; the heat generated by the tire running on the highway has far more to do with pressure increase than the outside air temp .

Every year I drive my coach from home where temps are about 40F to my snowbird site in three days where temps are usually in the low 90s and the pressure increase on arrival is within 5 psi of departure.
Considering my tire pressure requirements of my coach by weight when set to the tire manufactures charts are no where near max inflation, I don't worry about adjusting pressure on a daily basis.
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Old 01-06-2019, 11:48 AM   #3
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In the spring when it hits about 80 degrees here where I live I set all my tires pressures to 90 lb.

I leave them at that until the fall when it gets down to 40 at which time I again reset them at that temperature.

I've had days where I leave Clovis, CA at 105 degrees and wound up in 45 degree weather in Truckee CA. The next day I headed across Nevada where it was over 100.

I leave the tire pressures alone, elsewise I'd drive myself crazy resetting them.
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Old 01-06-2019, 12:40 PM   #4
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Thanks
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Old 01-06-2019, 12:41 PM   #5
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In the spring when it hits about 80 degrees here where I live I set all my tires pressures to 90 lb.

I leave them at that until the fall when it gets down to 40 at which time I again reset them at that temperature.

I've had days where I leave Clovis, CA at 105 degrees and wound up in 45 degree weather in Truckee CA. The next day I headed across Nevada where it was over 100.

I leave the tire pressures alone, elsewise I'd drive myself crazy resetting them.
Yes that's what I was thinking, I'd be driving myself crazy changing them.
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Old 01-06-2019, 12:46 PM   #6
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If you are sitting in one location and not traveling you do not need to adjust the tire pressure. Before you travel check your pressure and make the necessary adjustments.
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Old 01-06-2019, 02:15 PM   #7
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If you are sitting in one location and not traveling you do not need to adjust the tire pressure. Before you travel check your pressure and make the necessary adjustments.
True, but we do travel in the local area at least one a month.
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Old 01-06-2019, 10:24 PM   #8
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Set tire pressures to the Federal Tire Placard in your vehicle, and never worry about changing climate temperatures.
Wonder what people did before tire mfgrs began publishing load/minimum inflation charts?
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Old 01-07-2019, 05:41 AM   #9
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Set tire pressures to the Federal Tire Placard in your vehicle, and never worry about changing climate temperatures.
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Always set the tire pressure cold ; before the RV is driven for the day; the heat generated by the tire running on the highway has far more to do with pressure increase than the outside air temp.
These two recommendations form the basis for a sound practice.

The third is: Don't adjust tire pressures after the coach has been underway.

Cold morning to hot afternoon- no problem.

Hot morning to cold afternoon- check the next morning (or before moving the coach again, whenever that is). If tires are underinflated, inflate to placard, or whatever is your chosen tire pressure standard.

Here's an interesting exercise: Take the GAWRs (Gross Axle Weight Ratings) for your coach, run them through the manufacturer's tire inflation charts, and then compare those numbers with the placard values. I have done this for our coach.

In April, the morning temperature can vary between 75 (Florida) and 15 (New York). The tires I inflated to placard in FL will be under placard in NY. I can mitigate that somewhat by inflating above placard in FL, within reason. By knowing the difference between placard and inflation chart values, I can choose how far to let the cold inflation pressures drift below placard before I drag out the compressor. Or, I can run strictly by placard values.

Here is the disclaimer: The values in the manufacturer's inflation charts are the MINIMUM pressures necessary to support the corresponding weights. Running at MINIMUM pressures puts you at greater risk of under-inflation. I read that under-inflation causes more blowouts than over-inflation.
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Old 01-07-2019, 08:33 AM   #10
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These two recommendations form the basis for a sound practice.

The third is: Don't adjust tire pressures after the coach has been underway.

Cold morning to hot afternoon- no problem.

Hot morning to cold afternoon- check the next morning (or before moving the coach again, whenever that is). If tires are underinflated, inflate to placard, or whatever is your chosen tire pressure standard.

Here's an interesting exercise: Take the GAWRs (Gross Axle Weight Ratings) for your coach, run them through the manufacturer's tire inflation charts, and then compare those numbers with the placard values. I have done this for our coach.

In April, the morning temperature can vary between 75 (Florida) and 15 (New York). The tires I inflated to placard in FL will be under placard in NY. I can mitigate that somewhat by inflating above placard in FL, within reason. By knowing the difference between placard and inflation chart values, I can choose how far to let the cold inflation pressures drift below placard before I drag out the compressor. Or, I can run strictly by placard values.

Here is the disclaimer: The values in the manufacturer's inflation charts are the MINIMUM pressures necessary to support the corresponding weights. Running at MINIMUM pressures puts you at greater risk of under-inflation. I read that under-inflation causes more blowouts than over-inflation.
Thanks, going to the scales soon. It will be interesting for me to see the comparison to the placard.
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Old 01-13-2019, 12:54 PM   #11
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haven't looked...but is there a chart / graph of the typical tire pressure increase based on ambient temp change and post pre-driving and typical post driving?
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Old 01-13-2019, 01:10 PM   #12
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haven't looked...but is there a chart / graph of the typical tire pressure increase based on ambient temp change and post pre-driving and typical post driving?
The accepted rule for a 22.5" RV tire is 2% change per 10* temp change. Keep in mind that it is based on internal air temp and not necessarily OAT.
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Old 01-13-2019, 01:18 PM   #13
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Rough figures.........for each 10*F increase in Temp/1 psi increase in Press


Set tire pressures 'COLD'....not driven on for at least 4 hours and before SUN is shining DIRECTLY on tires






Curious.......
How frequent does anyone check daily driver vehicle tire pressures??


I checked truck/trailer EVERY Travel Day Morning....which was weekly/bi-monthly
Now that we aren't FTng.........check truck tires WHEN I suspect a tire might be low or when SHE asks "when was last time......"
Funny how 'we' make RV complicated/OCD and yet think nothing of our daily vehicles (Unless they are $$$ pits/clunkers---had a few of those)
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Old 01-13-2019, 01:31 PM   #14
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Checking tire pressure each day before you will be driving is more about air that may leak out though a bad valve and is more important than worrying about temp changes. After a while, good valves can develop leaks.


I have had several occasions where a valve develops a slow leak, which I would not know about if I didn't check. I also carry a compressor.
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