What is the purpose of the sidewall in a tire?

The purpose of the sidewall in a tire is primarily to protect the inner structure of the tire. The sidewall serves as a robust barrier that shields the inner components, including the layers of fabric and steel belts, from external damage such as abrasions, impacts from road debris, and harmful environmental factors. This protective function is essential for maintaining the integrity of the tire and ensuring its performance and safety.

Additionally, the sidewall also contributes to the overall construction by supporting the tire's shape and providing necessary flexibility during operation, which can affect ride comfort and handling. While other roles related to aesthetics or reducing weight may be secondary considerations in tire design, the primary function of the sidewall as a protector is critical to the tire's durability and longevity.