The sidewall is the weakest part of the tire. In the process of daily use of the car, if the owner does not pay attention, it is easy to cause side damage. Although the tire manufacturer does not recommend repairing the tire side, it is a direct replacement of the new tire. However, if there is some small damage on the sidewall, it is necessary to discard the tire, which is obviously too extravagant for the average owner. So, can the damage on the sidewall of the tire be repaired? Below, we will briefly discuss this issue.

● Why is it difficult to fix? The side of the sidewall is constantly stretched to affect the repair effect

We looked at the tire halls of the major tire manufacturers' official website and found that all manufacturers did not recommend users to repair the tire sidewalls. Taking Michelin as an example, their point of view is that after the tire sidewall is damaged, the carcass cord has been broken, and the tire has a bulging danger, so it is necessary to replace the new tire as soon as possible.

[The cord is located in the carcass ply and is arranged parallel to the tire section]

Although tire manufacturers do not recommend repairing the sidewalls, there is still a service for repairing the sidewalls. At present, the methods for repairing the sidewall are mainly cold-filled (stick rubber), hot-filled (hot-melt rubber) and mushroom nail repair.

The rubberized operation is simple and can repair large wounds, but it is not durable enough. After a long time, the rubber stuck on the wound will gradually fall off, and the wound will leak again.

The hot supplement is to attach a special rubber rubber to the wound, and then use the baking machine to bake the wound until the raw rubber and the tire are completely fitted. However, the heat supplement easily damages the ply in the tire, causing the consequences of collapse, which in turn increases the risk of tires. Therefore, hot supplement is not suitable for sidewall repair.

● The piercing hole is less than 6 mm in diameter and can be repaired.

For some small sidewall wounds, there is still a repair value because there is no serious damage to the ply, for example, the sidewall is pierced by a sharp object. This type of perforation usually does not break the cord on the ply, which is equivalent to the case where the needle passes through the sheet but does not break the cloth, so it can be repaired.

For this small area of the sidewall wound, the professional tire service shop will use a tire-side special steel needle plug (commonly known as 'mushroom nail') for repair.

[Basic steps to repair the sidewall of the sidewall with mushroom nails]

The entire repair process takes about 7 minutes, and the price depends on the size of the tire and the material of the tire. The price ranges from 60 yuan to 200 yuan. The advantage of using a mushroom nail to repair the sidewall is that it can repair the inner liner and fill the carcass at the perforation to ensure a more durable repair.

● The sidewall rubber is missing or cracked but can be repaired without leaking

If the tire is not leaking, the missing or cracked rubber in the shallow side of the sidewall can also be repaired. In this case, since the tire does not have a penetrating flaw, but the surface rubber is damaged, the sidewall rubber surface can be repaired by a heat compensation method.

● Cannot be repaired when there is a bulge on the sidewall

The occurrence of a bulge on the sidewall is the result of a severe break in the inner cord of the tire. When this happens, the tire has been sentenced to 'death penalty' and there is no value for repairing. New tires must be replaced. If it is barely repaired, the repaired tire can only be a dangerous product that may have a puncture at any time.

● Can not be repaired when the sidewall is severely damaged

The so-called 'severe damage' refers to the case where the sidewall rubber is completely cracked. Rubber cracking means that the inner layer of the tire, the ply, the protective layer and other structures have been completely destroyed, and the tire can only be scrapped.

● The tires that have been repaired on the sidewall can only be used as spare tires.

Although it can be repaired when the sidewall damage is not serious, the repaired tire has lost its original durability and safety and cannot continue to be the main force. For safety reasons, this repaired tire on the sidewall can only be used as a spare tire.

It should be noted that when using the tires that have been repaired on the side of the tire as a spare tire, it is necessary to strictly control the speed of the vehicle (recommended to maintain the speed of 80km/h) to ensure safe driving.

Summary: The sidewall can be repaired, but only if the tire ply is not seriously damaged. Therefore, we should choose a qualified professional tire service shop for tire damage assessment and sidewall repair, to ensure the quality of repair. If the cartilage is seriously damaged, we will still change the tires decisively. In order to save money and ignore safety, it is not worth the candle.