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The Tire Rack's Tire & Wheel Forum
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Old 08-25-2003, 08:29 PM   #1
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Join Date: Jun 2003
Location: Montreal, Canada
Posts: 742
My Ride: 328i
Question What temperature is the 'cold' temperature for tire pressure?


I wanted to know what is the cold read temperature for tire pressure?

10 C, 15 C, 20 C ?

afterwards, doing a PV=nRT will be easy enough to get a good approximation of what the new cold temperature is for when it's warmer/cooler outside.
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Old 08-26-2003, 02:58 PM   #2
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"cold" tire pressure is when the tire is cold, meaning either not driven or not driven more than 1 mile at slow speed. In other words, the tire itself is "cold". As far as what ambient air temperature is considered cold, well that depends on the jacket you're wearing. Kidding.
As long as you check your tire pressue regularly you'll be able to adjust for the temperature changes. If the air temps fall below 50 degrees F, then give the "cold" tire a pressure check. As temps fall so will the pressue in the tire.
As temps rise so will the pressue in the tire. That's why it's important to check and adjust tire pressure when the tire is "cold". That cold reading will accomodate the pressure rise as the tire heats up and the pressure within it goes up.

A big problem is during spring when people don't check their air pressure and are still using winter tire pressures. They drive the car as the ambient temps reach into the low 80's and soon, the pressure exceeds the tires limits and "BAM!", blow out.

I'm going to go with general normal ambient temps to be between 50-80 degrees F (convert to C), check and adjust when ambient temp is above 80F on a "cold" tire and check/adjust when the temp falls below 50F.

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