What is the purpose of a tire's sidewall?

The purpose of a tire's sidewall is to provide structural support and protection to the tire. The sidewall plays a crucial role in maintaining the integrity of the tire, as it helps support the weight of the vehicle and absorbs road impacts. This component of the tire helps to stabilize the overall structure by connecting the tread, which is the part that makes contact with the road, to the bead, which secures the tire to the wheel. Additionally, the sidewall acts as a protective barrier against cuts, abrasions, and other environmental factors that can damage the tire.

In contrast, the gripping surface for better traction is primarily attributed to the tread pattern, which interacts with the road surface. Heat dissipation during braking is more directly related to the materials used in tire construction and the contact with the ground rather than the sidewall itself. While tire inflation is important for maintaining proper pressure, this function is supported by the bead and inner liner of the tire rather than the sidewall. Therefore, the sidewall's main functions of structural support and protection make it an essential element of tire design.