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Aspect ratio: The ratio of the tire sidewall height (the distance from tread to rim) to its overall width. The ratio number is usually used with the expression ?series?. The lower the number, the lower the tire profile, this means that a 50-series tire has a lower profile than a 60-series tire. In most cases, a shorter sidewall height (lower series number) creates a more responsive tire, but it is less capable of isolating road noise and surface disturbances.