What is the maximum allowable difference in pressure between four tires?

[SanEverly]

4 tires are allowed to have a pressure difference within 0.1 bar, but exceeding 0.1 bar does not necessarily require adjustment. Factors such as the error in tire pressure monitoring, the vehicle's load, and different conditions can all cause temporary variations in tire pressure. Generally, the rear two tires will have slightly higher pressure than the front ones. Hazards of over-inflation or under-inflation: For tires, the pressure should not be too high or too low. Over-inflation reduces the contact area between the tire and the ground, leading to poor grip and affecting the vehicle's handling and driving stability. Under-inflation can cause wave-like deformation during high-speed driving, which affects the tire's lifespan and increases the risk of a blowout. Introduction to standard tire pressure: According to the international GBT2978-2008 standard, the recommended tire pressures are as follows: Standard tires: 2.4-2.5 bar; Reinforced tires: 2.8-2.9 bar; Maximum pressure: should not exceed 3.5 bar.