What does the sidewall of a tire extend from?

The sidewall of a tire is defined as the portion that extends from the bead to the shoulder. The bead is the part of the tire that fits onto the wheel rim and is crucial for maintaining air pressure within the tire. The shoulder is where the sidewall begins to transition into the tread, which is the part of the tire that makes contact with the road surface. This definition is essential in tire service and maintenance, as understanding the structure of a tire helps technicians identify wear patterns, damage, and necessary repairs or replacements. Knowing the specific parts of a tire and their functions is foundational for anyone involved in automotive services.