Moreover, the two front wheels still have serious eccentric wear problems, the tread pattern in the middle is deep, and the patterns on both sides are worn, which requires four-wheel alignment. After seeing the specific situation of the old tires, the owner no longer complains about the loss of changing the tires. Next, let's learn more about it through a few pictures.
As shown in the picture below, these are four old Dunlop tires, which have been replaced. The owner said that he hasn't changed it since he bought the car. It's been over five years. If you don't look carefully, you will feel that the tread pattern is still deep, as if it can still be used.
However, when we look closely, we can find problems. As shown in the green area below, the tread edge pattern has been worn, as has the left tire. The pattern in the middle of the tire is still very deep. It means it needs four-wheel alignment.
Let's look at the side of the tire again. As shown in the figure below, you can find a particularly obvious crack by pressing it gently with your hand, which fully shows that the tire is seriously aging? .
What about the date of the tire? Let's look at the green picture below, where 23 in the number 23 14 represents the 23rd week and 14 represents the year 20 14. Is this tire 20 14? It was delivered in June in the 23rd week, and it has been more than five years now, reaching the stipulated replacement time.
Before replacing a new tire, the master will grind the rim edge clean, as shown by the arrow in the figure below. The tire is sealed with a rim at this position. If there are too many impurities, the tightness of the tire will be problematic and it will leak slowly. ?
Soon, the master replaced the new tire, as shown by the arrow in the figure below. This is the date of the new tire. The master said it was delivered in the ninth week of 20 19. It took nearly a year, which was a little long, but the impact was not great and the tire price was lower. ? This also reminds our riders that when replacing new tires, it is best to look at the factory date of the tires.
As shown by the arrow in the figure below, there are generally two points on the new tire, and the valve corresponds to a yellow circle, indicating the lightest point of the tire. In this way, the weight of the wheel can be distributed as evenly as possible.
The red solid line point indicates the heaviest point of the tire. Theoretically, this should be the lightest installation of the corresponding rim, but it is not easy to find. Generally, it is enough to let the small yellow circle correspond to the valve. Sometimes there is no need to struggle because the new tires have to be rebalanced after installation to make the weight distribution more uniform.
As shown below, the master is balancing the tire, mainly by sticking a balance block on the rim. Dynamic balance should be carried out every time the tire is disassembled and assembled. If dynamic balance is not carried out, high-speed driving may shake.
Therefore, for cars with a lot of mileage or cars that don't change tires for a long time, we must pay more attention to the condition of tires, especially for cars that don't change tires for more than five years. The pattern is deep or the time is short, so it is not necessary to change the tire. You don't have to change the tires after five years. It should be based on the actual situation of the tire.
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This article comes from car home, the author of the car manufacturer, and does not represent car home's position.