The recommended tire pressure of different models is actually different. The reason why the repair shop defaults to inflating the tires is 2.5bar, or "2.5kg", in fact, it is to make the disciples not easy to make mistakes when inflating.

And according to the tire pressure of 2.5bar, this car is not prone to problems.

Cheers are usually apprentices, and 2.5bar is easy to remember.

The simple thing of refueling is usually done by apprentices, and 2.5bar is also easy to remember.

There is an article in the Journal of Vocational Education Newsletter, "Investigation on Students' Internship in Yinchuan Secondary Vocational School —— Taking Auto Repair Major of Yinchuan Vocational and Technical College as an Example", which talks about this situation.

Enterprises are relatively marginalized when arranging tasks for interns, and there are relatively few opportunities to participate in practical skills training.

But if the assigned tasks put forward higher requirements for interns, it may hurt students' enthusiasm.

To put it simply, the apprentice's job is relatively simple and not easy to make mistakes, so it is easier to fix the tire pressure of 2.5kg for each car than to give a car a tire pressure.

For example, just in the first grade, after learning pinyin and addition and subtraction, you will not be asked to write a composition, nor will you calculate multiplication and division, which is almost the feeling.

Playing 2.5bar is more suitable for most car owners

Although the tire pressure of 2.5bar is the national standard, it is high.

Why 2.5 bar? No way, everyone plays 2.4bar? What is the difference?

First of all, according to the national standard GB/T 2978-20 14, most cars use radial tires, and the standard inflation pressure is 250kpa.

Convert it into what we often say: 2.5kg, 2.5bar.

But in fact, the calibrated tire pressure of many family cars is lower than 2.5bar. For example, the recommended tire pressure of 19 Toyota Corolla (picture | configuration | inquiry) is 2.3bar；; 19 Honda CR-V (picture | configuration | inquiry) suggested that the tire pressure should be lower, only 2. 1bar.

Toyota Fangrong recommended tire pressure of 2.2bar；; The recommended tire pressure of Volkswagen LaVida is 2. 1bar.

The recommended tire pressure set by these vehicles is different from the national standard, but they are all the optimal values debugged by engineers.

For example, the national standard stipulates that the service life of an automobile part should be 6.5438+10,000 times, and the manufacturer thinks that it can do better, and it has achieved 200,000 times. Is this not good? Right?

But in general, many family cars hit 2.5bar, which is actually a bit high.

The higher the tire pressure, the safer it is.

However, it is actually safer for the repair shop to hit a high tire pressure of 2.5bar, because many car owners and friends did not check the tire pressure before going on the road.

JATMA (Japan Automobile Tire Association) made a survey, and 38% of cars were equipped with unqualified equipment when driving on the road, and 88% of them had inappropriate tire pressure.

In this case, high tire pressure is still relatively safer than low tire pressure.

Design of low frequency wake-up system for tire pressure detection.

If the tire is under-inflated, the tire will be excessively deformed due to excessive body pressure, and the tire temperature will rise sharply, leading to overheating and eventually the shell will break.

Moreover, it is emphasized that the potential danger of tire under-inflation is greater than that of tire over-inflation.

This is similar to doing a math problem. When it is impossible, the teacher will say, "It is better for you to write more than less." Isn't it?

The tire inflation is similar, and the tire pressure is low. If it is not good, the tire will burst.

Let the owner worry more.

Considering the tire itself will leak slowly, isn't it? A 2.5kg repair shop can also make our car owners and friends feel more at ease.

Han Tai official website wrote: The tire pressure will drop by 1 psi in one month, which translates to about 0.07bar, and will drop by 0.2 1bar in three months.

If the recommended tire pressure is 2.3bar, you can hit 2.5bar, and you don't have to worry about tire pressure for 3 months; Suggest calling 2. 1bar. It's good not to worry about tires for half a year.

You hit 2. 1bar, which is lower than the recommended tire pressure after three months, right? We can't cheer up every day, can we

Can play the best according to the manufacturer's requirements

But if some car owners and friends have the conditions, it will be better to play according to the suggested tire pressure, right?

Bridgestone official website has a note on the use and maintenance of tires: the tire pressure should be adjusted according to the air pressure recommended by the automobile manufacturer, but the cold tire pressure should be checked regularly once a month.

In other words, if you have time to check the tire pressure once a month, you really like your car.

Say to the man in the garage, "How much is my name for this car, you will follow me." This is of course the best.

Playing 2.5bar is relatively safe and sound.

To sum up, the repair shop pays 2.5kg, on the one hand, it makes the apprentice's operation not easy to make mistakes, and people can't do too many things, which is relatively safe and reassuring.

When our car has run out of gas, we may leave it for a few months, and then slowly come down, still above the recommended tire pressure value, at most a little bumpy.

It's on the low side, otherwise the tire will be broken. Okay, that's what it means.