Automobile long run always causes the tire pressure is not stable, then it has what harm? Automobile tire pressure increasing deformation deficiency will lead to increased heat of tire. Greatly reduce the tire life, and will bring the impact from the drum, tire delamination, there are security risks. While the tire pressure foot, it will lead to the decrease of the contact area of tire and ground, handling decline, prone to flick, sliding and other risk and will bring excessive tread wear, tire tire burst and other security risks.