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Old 02-26-2007, 03:37 AM   #1
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Location: New Brunswick, Canada
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Default Temperature and Tire Pressure

I copied this from Dunlop Tire's website:

Temperature Effects: Air pressure is affected by temperature. The air under pressure in a tire is no exception. Typically, an inflation pressure can change by 1 psi for every 10 degrees Fahrenheit of temperature change. Higher temperature means increased pressure.

For example, if a tire is inflated to 35 psi on an 80-degree July day, it could have an inflation pressure of 23 psi on a 20-degree day 6 months later in January. This represents a normal loss of 6 psi over the six months and an additional loss of 6 psi due to the 60-degree temperature change. At 23 psi, this tire is severely under-inflated.


When I left for my recent trip south it was right around freezing. When I got to Palm Desert is was close to 80 F. So my tires were probably 5 psi over-inflated. Probably not a problem. More of a problem coming from the heat to the cold. Then your tires would be under-inflated.
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