What is the normal tire pressure of the family car?

Around 2.2-2.5, this is a standard, but not all models will follow this standard. For example, the tire pressure of SUV models will be a little higher than that of car models, so the specific standard should be based on the logo given by the manufacturer, which will generally be displayed in the vehicle user manual or next to the door (B-pillar or C-pillar fittings), where you can see the manufacturer's recommended value (cooling tire pressure).

Tire pressure, strictly speaking, refers to the pressure of air inside the tire. The engine is the heart of the car in car maintenance, and the damage of the engine will lead to the exhaustion of the life of the car, so the tire pressure is the blood pressure of the car, and the level of tire pressure plays a vital role in the performance and power of the car.

Air pressure is the key to tires. Too high or too low will shorten the service life of tires. If the air pressure is too low, the deformation of the carcass will increase, and cracks will easily appear on the sidewall. At the same time, it will produce buckling movement, lead to excessive heating, promote rubber aging, tire cord fatigue and cord fracture. It will also increase the contact area of the tire and accelerate the wear of the shoulder.

If the air pressure is too high, the tire cord will be excessively stretched and deformed, and the elasticity of the carcass will decrease, which will increase the load when the car is running. Once hit, it will cause internal cracking and explosion. At the same time, too high air pressure will accelerate tire crown wear and reduce rolling resistance.