The specified dimensions of a pneumatic tire designated for use on a particular Toyota Prius model constitute critical vehicle information. These measurements, typically expressed as a combination of alphanumeric characters, define the tire’s width, aspect ratio, and rim diameter. For example, a marking such as “195/65R15” indicates a tire with a 195mm section width, a sidewall height that is 65% of the section width, and a radial construction designed for a 15-inch wheel.
Correct tire dimensions are essential for maintaining optimal vehicle performance, safety, and fuel efficiency. Using tires outside the manufacturer-recommended specifications can negatively impact handling, braking distance, speedometer accuracy, and electronic stability control systems. Furthermore, deviations from the recommended dimensions can affect the vehicle’s load-carrying capacity and overall ride comfort. Over time, these dimensions have evolved alongside advancements in tire technology and changes in vehicle design, impacting factors like rolling resistance and noise reduction.