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 > Tire pressures during temperature swings

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DarkSkySeeker

Freestone, California

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Posted: 12/13/18 09:43am Link  |  Quote  |  Print  |  Notify Moderator

I see a 3-4 PSI rise in my Ram 2500 tires from a cold start to highway driving after 30 minutes.

During the day, if starting off from a cold location, to the hottest destination, do you account for the warmup and adjust your pressures to compensate?

I figure from a freezing location to a hot desert destination, I could see a 70F air temp swing, and wonder if I should bleed pressure as the tires get warmer and warmer.

* This post was edited 12/13/18 03:10pm by DarkSkySeeker *


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fj12ryder

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Posted: 12/13/18 10:01am Link  |  Quote  |  Print  |  Notify Moderator

Don't overthink the whole thing. Check your tires in the morning, adjust as necessary. Do the same the next morning, and the morning after that. Trying to keep tires at a mean pressure while actually rolling down the road is just a waste of time and effort. 10 psi pressure changes as tires heat up and cool down is perfectly normal.


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phillyg

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Posted: 12/13/18 10:02am Link  |  Quote  |  Print  |  Notify Moderator

According to every tire mfgrs. info, you set pressure when the tires are cold, i.e., not having been driven on, and leave it alone.


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SidecarFlip

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Posted: 12/13/18 10:04am Link  |  Quote  |  Print  |  Notify Moderator

Interesting subject. I had my TPS come on, on my car the other day. I know none of my tires leak and I usually check and air them every 3 months but it's been cold here and my tire pressure had dropped below the TPS threshold. I aired them back up and all is good.

I don't believe 3-4 pounds means squat. I always run my TP at the maximum sidewall rated pressure. I get better fuel mileage that way.


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MFL

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Posted: 12/13/18 10:04am Link  |  Quote  |  Print  |  Notify Moderator

I never bleed air from morning start, while driving to destination. I will wait until next morning, at new location, to adjust.

Yes, a 70 degree difference in temp will make a noticeable difference. While this is not the norm, in this case I might consider starting pressure a lb or two less, while days end will likely be over pressure. In any case, tires are designed to inflate when heated, but tire makers still say "go by cold pressure, before travel."

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Vette Racer

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Posted: 12/13/18 10:14am Link  |  Quote  |  Print  |  Notify Moderator

I set mine at 122 in the morning and usually see temps in the 145-150 range but once going from high altitude and cold temps to lower and hot temps tires went from 122 to 165 according to TPMS.


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DarkSkySeeker

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Posted: 12/13/18 10:18am Link  |  Quote  |  Print  |  Notify Moderator

I like the statement, "don't overthink it".

And, I'd expect the pressures the next day to be nearly what they were the day before.

I've seen 8-10+ PSI increases from the coldest starts to the hottest running, and I have to admit (despite the references to tire mfg-ers statements) that it concerned me.

One time, I stopped on the side of the highway and bled 4 PSI of pressure.

drsteve

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Posted: 12/13/18 10:25am Link  |  Quote  |  Print  |  Notify Moderator

phillyg wrote:

According to every tire mfgrs. info, you set pressure when the tires are cold, i.e., not having been driven on, and leave it alone.


What he said^^^^^^

Tires are engineered to be driven on without constant air pressure adjustments. Set the cold pressure, hit the road, don't worry about it.


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donn0128

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Posted: 12/13/18 10:32am Link  |  Quote  |  Print  |  Notify Moderator

This is all silly nonsense. Unless you have a leak a tire will only loose 1-2 pounds in six months. I checked my tires at the start of the season and leave them alone. Heck, you can loose 2 PSI every time you check them.

* This post was edited 12/13/18 11:04am by donn0128 *





GordonThree

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Posted: 12/13/18 10:33am Link  |  Quote  |  Print  |  Notify Moderator

So no problems if I set the cold pressure at 15F ambient and later in the day it's 50F ambient? Often see huge swings like that around spring.


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