Tire pressure will rise or fall with the change of air temperature and tire temperature. Generally, the tire pressure of cars and SUVs is around 2.3-2.5 when the cars are cold. Too low or too high tire pressure will affect the service life of tires. If the tire pressure is too low, its radial deformation will increase, and the deformation on both sides of the tire wall will be excessive, which will lead to the wear of the tire crown and shoulder and increase the tire temperature.