A friend had a broken tire and went to the repair shop to have the tire repaired. The teacher saw that the tire could not be repaired and had to be replaced at the same time. The friend thought that the tire had been repaired only once. Why can't the tire be repaired again? Why do you need to change the tire on the other side? A little confused, he asked me for help. Today, I'd like to give you a detailed explanation.

1. How many times can a new tyre be repaired? Do you have to change one side with the other?

A: a new tyre can be repaired in 2 places at most, and the distance between the two places shall not be less than 40cm.

If one side of the tire needs to be replaced, check the other side of the tire. As long as there is no damage, generally two tires need not be replaced. However, when changing tyres, the specifications should be exactly the same. At the same time, replacing two tires at a time can avoid the problems of different brake friction and different tire outer diameter caused by different tire wear.

2. Driving 20000 km in 6 years, the tires are not seriously worn and free of cracks. Do you want to replace them?

Answer: in addition to observing the wear degree, we should also pay attention to the service life of tires. According to the national standard, the service life of tire rubber is 3 years, and BS promises 5 years, so under normal circumstances, the service life of 6 years, no matter how much wear, should be replaced with new tires.

3. The tire pressure is 2.5bar, which drops to 2.0bar in 20 days. The other three tires are normal. No air leakage is found during inspection. Why?

Answer: the pressure drop is 0.5bar after 20 days of use. If no air leakage point is found in the inspection, the possible reason is that there are foreign matters such as oil mud at the joint of tyre bead and rim. There is air leakage during driving, but not too much. There is no air leakage under static state and it cannot be detected. It is recommended to clean the rim to eliminate it.

4. Should the daily car be equipped with anti blowout tires or ordinary tires?

A: most models are equipped with ordinary tires. If an ordinary vehicle is equipped with an explosion-proof tyre, in addition to the air pressure alarm device, it is necessary to consult a professional organization for the feasibility of installing the explosion-proof tyre. At present, only high-end vehicles such as BMW and Mercedes Benz are equipped with explosion-proof tires, while most other vehicles are only equipped with ordinary tires.

5. 50000 km in 3 years, with small cracks on the sidewall and high tire pressure ratio, can it still be used?

A: according to the above conditions, the tire can be used continuously, because the small crack is a normal aging phenomenon of the tire, which does not affect the safe use of the tire.

6. Is it necessary to rotate the tires? How often?

A: tyre transposition is an effective way to extend the service life of tyres. We suggest 8000-10000km, and it is better to replace once.

7. Is there any influence on the car due to different tyre patterns and brands in front and behind the wheel?

A: it has an impact, because there are performance differences between different brands of different tread patterns. In order to ensure the safety of vehicle driving, it is recommended that the whole vehicle must use tires of the same brand and tread pattern.

8. Generally, how much air pressure is suitable for compact car in cold state?

Answer: the air pressure given by the vehicle manufacturer is usually low. In order to avoid driving safety on uneven roads, increase the air pressure to 2.3-2.5bar, which can basically meet the normal use. Increasing the air pressure of some tyres and reducing the heat generation due to bending are the main methods to ensure the safety of tyres, which are also applicable in summer.

9. How to check whether the tire is safe when the 60-80km/h speed is over 50mm and the rim edge is painted off? What is the measurement standard?

A: usually when the tire passes through the pit, the collision of two edges will cause damage to the rim. If there is no bulge in the sidewall corresponding to the damaged rim, the tire is safe and can be used continuously.

10. Is 19 inch rim, 45 flat ratio and thin sidewall more likely to blow out?

A: in terms of the structural design of the tire, the strength of the sidewall of the tire is higher than that of the bead. If it is not impacted by an external object that exceeds the strength of the sidewall, the sidewall will not blow out.

I: after reading it, you can understand that the safety of driving is the most important thing. If you are not sure, you can listen to the master!