Temperature Effects

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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 lose enough air to have an inflation pressure of 23 psi on a 20-degree day the following January. This represents a loss of 6 psi over 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.

NOTE: For safety and vehicle performance, you should recommend to your customers that they check tire inflation pressure at least once each month and as often as possible, when the tires are cold (ambient air temperature or if the vehicle has not been driven for several hours).

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