For instance, you might see a tire size in the format 28.5x9R17LT 115R.įlotation tire sizes are a little different in that they are measured in inches rather than millimeters and the numbers refer to different attributes of the tire.
While euro metric and P-metric sizing are the most common, you might also see sizing using a different standard when looking for high-flotation or light truck tires. The tire size chart below shows common metric tire sizes and their height and width converted to inches.Ĭhart showing the tread width and tire height in inches for common metric tire sizes Tire Size
#Aspect ratio calculator for tires how to#
Of course, you can use a calculator to compare two tires, but keep reading to learn how to calculate the size of a tire. Ensure the tires have a rating equal to or greater than the vehicle’s speed capability. The final letter in the tire designation is the speed rating and corresponds to the rating for the maximum speed the vehicle can travel when using the tires.
#Aspect ratio calculator for tires code#
The load index is a code that corresponds to a load rating for the tire. For instance, a P225/65R17 98H tire requires a 17″ rim.Īfter the rim diameter, there will be a space then another number, which denotes the tire’s load index. The next number denotes the rim diameter, or wheel size, in inches. An “R” is the most common and denotes a radial construction, but some other types might be used, such as “D” for diagonal bias construction. The letter following the aspect ratio indicates the tire construction. Similar to the aspect ratio for a TV, the aspect ratio is the ratio of the tire height to the width and is used to determine the height using a formula. The two or three numbers immediately after the slash (“/”) indicate the aspect ratio of the tire.
The section width and the wheel offset need to be taken into consideration to determine where the wheel will sit in relation to the vehicle to determine if the tires will rub the wheel-well or stick out too far from the vehicle. This is the width from sidewall to sidewall and is also called the section width or tread width. The first three numbers in the tire designation before the slash (“/”) denote the tire width in millimeters. A “P” indicates that the size is a P-metric size, but there are also euro metric and LT-metric types. The first letter in the tire designation is the vehicle type and denotes which type of designation the tire uses.
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