Add it all up, divide by four, and make sure your replacement tires have a corresponding load rating. This will require some math to figure out the vehicle weight, the trailer weight, and the weight of a load you may carry inside the vehicle while towing. If you intend to tow a heavy boat or trailer, you should buy tires with a higher load rating. If a car weighs 4000 pounds, then each tire handles 1000 pounds with no passengers or cargo aboard. A 93 load rating means that tire is certified to carry up to 1433 pounds at maximum inflation pressure. Load ratings range from 0 to 279 and each has a corresponding weight associated with it. Bias ply tires were used prior to the mid 1970s.ġ7: The tire's inner diameter, which matches the outer diameter of your car's wheels.ĩ3: Load Rating. You may also see B in this spot for Bias Ply. R stands for Radial, and all new cars and light trucks today use radials. Smaller aspect ratios, such as 35 or 40 are generally reserved for performance tires on sports cars. As aspect ratios decrease, the tire's firmness increases. A 245/45 is 45 percent as tall as it is wide, making it approximately 110.25 millimeters tall. It is expressed as a percentage of the width. This is the sidewall's height from the inside diameter to the outside diameter. The tread width is actually somewhat smaller than the tire's actual width.Ĥ5: Aspect Ratio. ![]() A 245 is 245 millimeters, or 24.5 centimeters, wide. An LT tire has a sturdier construction than a P tire, and it can carry a greater load, which we will talk about later.Ģ45: The width of the tire, from sidewall to sidewall, in millimeters. P is the most common and it means Passenger. P: The first letter stands for the tire's intended use. ![]() Those numbers and letters can seem like Greek, so let's figure out how to read tire sizes by defining them one at a time. Ever wonder what the numbers on a tire mean? The typical tire size is expressed something like this: P245/45R17 93H M+S.
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