Tires are an important part of a car, they are in direct contact with the ground and bear the weight and power of the vehicle. Therefore, the condition of the tires affects the performance and safety of the vehicle. The condition of the tire, in addition to whether the tire itself is damaged, also depends on the air pressure inside the tire.
The air pressure inside the tire, also known as the tire pressure, refers to the pressure of the gas inside the tire against the tire wall. There are several units of tire pressure, the most common ones are bar, psi and kg c. The conversion relationship between these units is: 1 bar = 100 kpa = 145psi=1.02kg/c㎡。
Tire pressure is not a fixed value, but varies depending on the model, tyre and load. Every car has a manufacturer-recommended standard tire pressure, which is measured in a cold state, which means that the tires are not affected by temperature and driving. This standard tire pressure is the most suitable tire pressure for the model after many tests and balances by the manufacturer.
So, how do we know what the standard tire pressure is for our car?Actually, it's very simple, just look at the label on the car. This label is usually attached to the cab or near the passenger door frame, near the left instrument panel, on the back of the fuel tank cap, etc., and will indicate the standard tire pressure of the front and rear tires, as well as the tire pressure adjustment under different load conditions.
However, many people do not pay attention to this label, but Xi inertia to beat the tire pressure to 25bar, which is the "experience value" of some veteran drivers or auto repair shop masters. Actually, it is unscientific to do this, because 25 bar may not be suitable for all models and tires, and may be too high or too low a tire pressure.
So, what happens if the tire pressure is too high or too low?
If the tire pressure is too high, the tire will become very stiff, the tread will be raised, and the ground contact area will decrease, resulting in a decrease in the grip of the tire, affecting the braking and steering performance of the vehicle. At the same time, too high tire pressure will also accelerate the wear of the tire, especially the middle part, shortening the life of the tire. In addition, high tire pressure will also reduce the cushioning capacity of the tire, making it easier for the vibration of the road surface to be transmitted to the body and affecting the comfort of the ride.
If the tire pressure is too low, the tire will become very soft, the tread will be dented, and the ground contact area will increase, resulting in an increase in the rolling resistance of the tire, which will affect the power and fuel consumption of the vehicle. At the same time, if the tire pressure is too low, it will also accelerate the wear of the tire, especially the side parts, and shorten the life of the tire. In addition, if the tire pressure is too low, it will also reduce the stiffness of the tire, which will cause the tire to deform too much when it is impacted, which may cause the tire to burst or the rim to deform.
Therefore, too high or too low tire pressure can have a detrimental effect on the performance and safety of the vehicle. Only by maintaining the standard tire pressure can the tires perform at their best.
According to statistics, 75% of tire failures are related to tire pressure every year, and 70% of traffic accidents on highways are caused by punctures. Therefore, in our daily driving, we must regularly check and adjust the tire pressure, and control the tire pressure within the range near the standard tire pressure, so as to ensure the performance and safety of the vehicle.