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Open Roads Forum  >  Tech Issues

 > Tire Pressure in Cold Weather

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Harvard

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Posted: 11/29/12 10:12am Link  |  Print  |  Notify Moderator

In anticipation of heading south I am checking tire pressures, the temperature outside today is -13C (8.6F), the MH is parked, the tires are cold soaked.

Is it safe to assume that all posted tire pressures are at 60F (15C or 288 absolute)?

If that were so then my desired 80 PSI at 60F would be 72PSI at a -13C (8.6F or 260 absolute). Am I correct in this assumption?

downtheroad

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Posted: 11/29/12 10:21am Link  |  Print  |  Notify Moderator

Sounds good...but too confusing for me. I keep it simple and check/inflate them to the proper psi in the morning after they have been sitting....regardless of the outside temp.

If there is a large ambient temp different after I have driven for a couple of hours I might (might) check them again, but probably not until the next morning before we set out again.


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smkettner

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Posted: 11/29/12 10:23am Link  |  Print  |  Notify Moderator

I think you still want 80psig in the tires as you start the journey. Adjust every couple days if you feel inclined.


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ksg5000

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Posted: 11/29/12 10:25am Link  |  Print  |  Notify Moderator

Not sure I have ever seen a tire pressure temperature compensation chart - as such I don't think there is any need/demand. I would add that tire pressure is suppose to be based on the weight of the rig - not what's on the sidewall (that can be small/large difference depending on rig - 15 lb difference in my rig)


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Posted: 11/29/12 10:46am Link  |  Print  |  Notify Moderator

Tire pressure on sidewall is tire cold. Not setting in the sun or driven. Mornings are best to check. They should be set a sidewall presure (If that is what you use.) Each time you check them cold. I would fill them now as it will help your driving.. As you get to warmer temps you will only need check them and let some air out..


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Dick_B

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Posted: 11/29/12 11:12am Link  |  Print  |  Notify Moderator

The good news is that as you travel farther south you can let air out instead of having to carry a compressor to put more air in. Now on the way back...


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2oldman

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Posted: 11/29/12 11:15am Link  |  Print  |  Notify Moderator

There are too many Google hits on 'tire pressure temperature'.

93Cobra2771

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Posted: 11/29/12 11:50am Link  |  Print  |  Notify Moderator

Inflate to the proper pressure prior to heading out. No matter what the outside temp is.


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wolfe10

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Posted: 11/29/12 03:18pm Link  |  Print  |  Notify Moderator

Yes, ONLY correct answer is to inflate to correct PSI (based on weight carried) plus perhaps 5 PSI safety cushion BEFORE DRIVING AT CURRENT AMBIENT TEMPERATURES.

No such thing as any tire company that states PSI at a specific temperature! Those who even hint that this is so-- let them provide a link to a tire company suggesting such!


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Harvey51

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Posted: 11/29/12 10:27pm Link  |  Print  |  Notify Moderator

If you inflated to 80 psi in a warm garage, then drove outside the pressure would soon be 72 psi.
The important thing is how warm are the tires on the highway. I'm sure they run cooler on a cold day than on a hot day. So it makes sense to put more air in the tires come winter time. Probably pumping up the 72 psi to 80 would be about right, as others have already said.


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