What does the aspect ratio of a motorcycle tire mean?

1 Answers
McFernando
07/30/25 8:14am
The aspect ratio of a motorcycle tire refers to the percentage of the tire's sidewall height relative to its width. A smaller value indicates a flatter tire shape, while a larger value results in a bulkier tire appearance. The role of tire width: To ensure sufficient load-bearing capacity and improve driving stability and grip, the width of tires and rims has to be continuously increased. As a result, the cross-sectional shape of tires has evolved from an approximately circular form to a flatter elliptical shape. However, with the increase in vehicle speed, the diameter of tires has been continuously reduced to lower the car's center of gravity and axle center. The lower the tire's aspect ratio, the more stable the ride and the stronger the handling performance. Tire selection: Car wheels generally use radial tires. The specifications of radial tires include width, aspect ratio, inner diameter, and speed limit symbols. For example, a tire specification of 205/65R15 means the width between the two sidewalls of the tire is 205 millimeters, 65 represents the aspect ratio, "R" indicates a radial tire, and 15 is the inner diameter of the tire, which is 15 inches. Some tires also include speed limit symbols, represented by letters such as P, R, S, T, H, V, Z, etc., each denoting a specific speed limit value.
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