Tire Pressure

Tire pressure is the air pressure inside a tire, commonly measured in pounds per square inch (PSI) or kilopascals (kPa). Correct pressure supports load capacity, predictable handling, tread wear and fuel efficiency.

Where to find the correct pressure

Use the vehicle information placard, normally located on the driver’s door jamb, and the owner’s manual. The pressure moulded on the tire sidewall is generally a maximum value associated with the tire’s rating, not the routine recommendation for the vehicle.

Check pressure when cold

A cold reading is taken before the vehicle has been driven far or after it has been parked long enough for the tires to cool. Pressure rises as the tire warms during driving, so releasing air from a warm tire can result in underinflation later.

Why pressure changes

Temperature, slow leaks and normal air loss can change pressure over time. Check all tires regularly with an accurate gauge and inspect any tire that repeatedly loses air. Adjustments may also be required for heavy loads or towing according to approved vehicle and tire guidance.

Related terms

Cold inflation pressure, TPMS, load index and underinflation.