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About Tire SizeTire size is an expression that defines a particular tire in terms of its width, height, rim diameter, aspect ratio and construction type. Rim Diameter - The height of the rim or the longest straight line that can be drawn between any two points on the rim. Load Index The load index refers to the load-carrying capacity of a tire, or how much weight a tire can support. For example, if a tire has a load index of 89, it can support 1,279 pounds at maximum air pressure. Speed Rating - The speed rating of a tire is based on U.S. Government standards for reaching and sustaining a specified speed. Typically, a tire with a higher speed rating results in better handling. Speed ratings are determined via laboratory tests that simulate road performance at various speeds. Tires are assigned a single letter (such as H or V) to designate speed rating.
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