Question

Which of the following statements regarding zipper ruptures is correct?

1) Sidewall bulges and popping sounds indicate broken cords.
2) They can occur in bias and radial ply tires.
3) They are caused by excessive heat.
4) All of the above.
5) None of the above.

Answer 1

Zipper ruptures can occur in both bias and radial ply tires and are characterized by sidewall bulges, popping sounds due to broken cords, and can be caused by excessive heat.

Step-by-step explanation:

Zipper ruptures in tires are a dangerous occurrence that can happen to both bias and radial ply tires. The term ‘zipper rupture’ refers to the specific way a tire fails when the sidewall cords break, resembling a zipper opening.

These ruptures can indeed be indicated by sidewall bulges and popping sounds, which are signs of broken cords within the tire’s structure. Furthermore, excessive heat can contribute to the degradation of tire materials, leading to such failures. Heat, alongside other factors such as under-inflation, overloading, or damage to the tire, can weaken the tire structure and increase the likelihood of a zipper rupture.