How is the aspect ratio of a tire defined?

The aspect ratio of a tire is defined as the ratio of the height of the tire's sidewall to its width, expressed as a percentage. This measurement provides critical information about the tire's profile and shape. A higher aspect ratio indicates a taller sidewall relative to the tire's width, which can affect the ride comfort and handling characteristics of the vehicle. In contrast, a lower aspect ratio suggests a shorter sidewall, which generally enhances performance and responsiveness but may result in a stiffer ride.

Understanding the aspect ratio is essential for proper tire choice and vehicle performance, as it influences both the handling of the vehicle and the ride quality. For instance, tires with a high aspect ratio tend to provide better cushioning over rough surfaces, while those with a lower aspect ratio are more suitable for high-speed stability and cornering ability.