The specification details the appropriate dimensions of tires designed for a specific vehicle model and year. This numerical designation, typically found on the tire sidewall and vehicle placard, indicates the tire’s width, aspect ratio, and wheel diameter.
Adhering to recommended dimensions is crucial for maintaining vehicle performance, handling, and safety. Using tires outside the specified range can negatively affect speedometer accuracy, braking efficiency, and overall ride quality. Historically, manufacturers have provided these specifications to ensure optimal vehicle operation under various driving conditions.