Measure Tire Pressure When the Tires Are ìColdî
All tire and vehicle manufacturer recommendations are based on cold pressures.
ìColdî means that the tire has been stationary for at least three hours or has not
been driven more than 2 km. A tire will warm up by as much as 35°C in normal
operation, depending on the road surface and the type of driving. Most tires reach
an equilibrium temperature after about an hour of driving.11
Measure each tireís pressure (including the spare tire) when cold at least once a
month (or any time there is a sudden change in temperature.) If your vehicle has a
temporary spare, note that the specified air pressure, as indicated in the ownerís
manual or on the vehicle information placard, is higher than for the tires on the
vehicle.