Do tires pressures change dramatically in cold weather?

[RWE TexM3]

My tires are fine...just got them rotated so i know the pressures are good...

But when i went to check them the meter showed like 25 PSI as opposed to the recommended 32 PSI.

Does this mean I am short on pressure or is it just the cold weather (around 32 degrees)

[ridr4lif]

Yes. I belive tires will lose 1 lb. of air per 10 degree drop in weather. It also works the other way around.

[Emil]

Yes. I belive tires will lose 1 lb. of air per 10 degree drop in weather. It also works the other way around.

They will lose one 1lb of air pressure you mean? Yes, when they warm up they should go up to normal PSI. In that case, make sure u warm them up really really quick :devillook ;)

[RWE TexM3]

Yes. I belive tires will lose 1 lb. of air per 10 degree drop in weather. It also works the other way around.
hmm...so those stickers on the doors..what temps are they assuming

[Boondoggie]

hmm...so those stickers on the doors..what temps are they assuming
They are assuming you will adjust your tires to that 32psi or whatever regardless of the outside temp.

[Kevlar]

Use nitrogen if you can ... it is not as susceptible to air temperatures changes.

[erikerikerik]

CostCo FTW on Nitrogen. :buttrock
And before you ask, yes you can mix pump air with nitrogen

[magnetic1]

Yes. I belive tires will lose 1 lb. of air per 10 degree drop in weather. It also works the other way around.

Actually it's 0.7 psi per 10 degrees :stickoutt

[Daved]

Actually it's 0.7 psi per 10 degrees :stickoutt
Celcius or Fahrenheit?

[magnetic1]

Celcius or Fahrenheit?

F.

Actually.. it really depends on the total pressure...

a 32psi tire would lose less air than a 50psi tire... cant remember the exact details now... but you can plug in #s into PV=nRT and figure it all out.


^ as you can tell.. work is VERY slow today :stickoutt

[M3 Pete]

Actually it's 0.7 psi per 10 degrees :stickouttand just to confirm, you should be running the recommended pressures for cold tires, whatever cold means in your neighborhood, right? In other words, you don't try to second guess the ambient temps. If it's 30 degrees out, you check the tires stone cold and put the recommended psi in them, right? Same if it's 90 degrees out, right?

So if you drive from sunny So Cal (75) to Mammoth for skiiing (20), you should put some more air in the tires when you arrive? (and let some out when you leave?)

[RWE TexM3]

and just to confirm, you should be running the recommended pressures for cold tires, whatever cold means in your neighborhood, right? In other words, you don't try to second guess the ambient temps. If it's 30 degrees out, you check the tires stone cold and put the recommended psi in them, right? Same if it's 90 degrees out, right?

So if you drive from sunny So Cal (75) to Mammoth for skiiing (20), you should put some more air in the tires when you arrive? (and let some out when you leave?)
wondering the same

[G. P. Burdell]

Quoted from http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=73:

It's important to remember that your vehicle's recommended tire pressure is its cold tire inflation pressure. It should be checked in the morning before you drive more than a few miles, or before rising ambient temperatures or the sun's radiant heat affects it.