Can I mend a broken tire?

How many times can a tire be mended at most?

The number of times a tire can be repaired varies from manufacturer to manufacturer. Generally speaking, a tire can only be repaired four times at most in theory.

There is still a difference between theory and practice. Let's talk about theory first. The included angle from the tire center to each patch should not be less than 90 degrees. In other words, a tire is 360 degrees, the minimum requirement is 90 degrees, and it can only be replenished four times at most. However, in actual use, there are no more than three patches that meet this condition. Generally speaking, it is meaningless to fill two holes. Even if it is repaired, the security risk is great.

Under what circumstances is it not recommended to repair tires?

① The damaged tire side of the car cannot be repaired. The sidewall is the weakest part of the tire. If it is damaged, it will increase the hidden danger of puncture and be more difficult to repair. Therefore, maintenance is not recommended, and it is best to replace it.

(2) According to the characteristics of tires, foreign research institutions have issued technical specifications for tires, one of which roughly means that the damaged diameter of tires is greater than 1/4 inches (6.35 mm), and the main structure that will affect the safety of tires after repair is the ply between the tread and the tire bottom, that is, there is no need to repair.

③ The tire has been repaired once when it meets the standard requirements. If the angle between the center of the second damaged part and the first part is less than 90 degrees, it is not recommended to repair it.

(4) Under the condition of meeting the standard requirements, the tire has been repaired twice. If it is unlucky and punctured, then maintenance is not recommended, and safety must be put in the first place.

⑤ If the tread depth (tire thickness) caused by tire wear is less than 2mm, repair is not recommended.