Dot by dot vs full aspect ratio9/7/2023 ![]() Load Index values and load capacities for these tires can be found in TRA manuals. The "LT" designation stands for "Light Truck." These tires are intended for more severe use often seen on trucks and follow load and inflation standards established by the Tire and Rim Association (TRA). Tires with a “LT” are for light truck or SUV use only. Some light trucks and SUV’s are equipped with original equipment P-metric or hard-metric tires. Some passenger car tires may not have a “P” and are considered hard-metric tires. Tires with a “P” are for passenger car use. The section height is approximately the distance from the rim to the tread surface of the tire when it is not carrying any weight. The section height of the tire is measured in millimeters also. This is the width of an inflated tire in millimeters at its widest point from sidewall to sidewall. The width of a tire is referred to as its section width. The lower the aspect ratio, the shorter the sidewall and the wider the shoulder-to-shoulder width. The aspect ratio is the dimensional relationship of the section height to the section width. The "R" stands for "radial," indicating the tire has radial construction. You can learn more about changing the diameter of the wheels of your car in the Plus Sizing section. The diameter indicates the size of the wheel from one side to the other. ![]() Your Toyo Tires dealer can provide you with more information on speed ratings. Remember to never operate your vehicle in an unsafe or unlawful manner. When replacing tires on your vehicle, you should use replacement tires with a speed rating equal to or greater than that of the original equipment tires if the speed capability and handling characteristics of the vehicle are to be maintained. These test procedures do not take into account underinflation, tire damage, vehicle characteristics or road conditions which can lead to sudden tire failure or loss of vehicle control at much lower speeds than indicated by the tire's speed rating. Speed ratings are determined by indoor laboratory testing methods, which measure high-speed tire durability under controlled test conditions. An equal or greater load index does not always correspond to equal or greater capacity at all inflation pressure settings, particularly when comparing P-metric and metric passenger car tires.Ĭlick here to view the complete load inflation index.Įxamples of Tire Size and Load Index Value Differences The load index may not be used independently to determine replacement tire acceptability for load capacity. The load index is a numerical code associated with the maximum load a tire can carry at the speed indicated by the tire's speed symbol under certain specified service conditions. When replacing tires on your vehicle, you should use replacement tires that meet or exceed the load carrying capacity of the original equipment (O.E.) tires.Ĭheck the tire size, load index and speed symbol on the vehicle's tire placard. The load index and speed rating correspond to the maximum load-carrying capacity of the tire and its maximum speed capability.
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