When should tire pressure ideally be checked?

Tire pressure should ideally be checked on a cold tire because this provides the most accurate reading of the tire's inflation level. A cold tire refers to one that has not been driven for several hours, allowing it to cool down to ambient temperature. Checking tire pressure when the tire is cold avoids the influence of heat generated from driving, which can cause the air inside the tire to expand and give a falsely elevated pressure reading.

This practice is vital for ensuring that tires are inflated to the manufacturer's recommended pressure, which is typically indicated on a sticker located on the driver's door jamb or in the owner's manual. Maintaining correct tire pressure is essential for optimal vehicle performance, safety, fuel efficiency, and tire longevity.