The specification denotes the correct dimensions for tires compatible with a specific model-year vehicle produced by Toyota. This specification includes aspects such as width, aspect ratio, and rim diameter, all crucial for ensuring safe and efficient vehicle operation. For instance, a specification might indicate a tire with a width of 255 millimeters, an aspect ratio of 70 (meaning the tire’s sidewall height is 70% of its width), and a wheel diameter of 18 inches, commonly written as 255/70R18.
Adhering to the vehicle manufacturer’s recommended tire specification is important for maintaining proper vehicle handling, braking performance, and overall safety. Utilizing the correct tire dimensions preserves the accuracy of the speedometer and odometer readings. Furthermore, using tires within the specified range contributes to optimal fuel efficiency and minimizes the risk of tire-related issues, such as premature wear or handling instability. Historically, vehicle manufacturers established tire specifications based on rigorous testing and engineering considerations to ensure the best possible performance characteristics for the vehicle.