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How to Determine Tire/Wheel Diameter

If you want to know if a particular spare tire cover will fit, or are trying to find out how much

clearance you would have when switching to another tire/wheel combo, there is an easy way to find

out. Simply read the numbers off the sidewall of your current vehicle or trailer tire.

Common Tire Size Parts

The most common tire sizes will have three parts, just like the 205/75-R15 tire pictured above. This number will tell you three things about the tire

and wheel combination that you are trying to fit.

The First Number

The number 205 represents the section width of the tire, in millimeters. This is the measurement of

the tire at it s thickest point. If you want to convert centimeters to inches, divide the number of

centimeters by 2.54. 1 Inch is about equal to 2.54 centimeters.

Example: 20.5 cm / 2.54 = 8.070 in

A 205/75-R15 tire would have a section width of 8.070 inches.

The Second Number

The number 75 refers to the sidewall aspect ratio. This will help you find out the height of the

sidewall, from rim to tread. This is also called sect ion height. The second number in a tire s ize

indicates the ratio between tire width and height.

Example: 8.070 in x 0.75 = 6.053 in

A 205/75-R15 tire would have a section height that is 75 percent of 8.070 inches.

The Third Number

The last number, 15 in our example, represents the diameter, in inches, of the wheel on which the

tire is mounted.

Determining Total Diameter

Now that you know the section width, section height and rim size of the 205/75-R15 tire and wheel,

you are able to determine the total diameter. The section height, or sidewall on the tire, is 6.053

inches. Multiply this by 2 to determine the amount of tire extending out on both sides of the wheel.

Imagine drawing a straight line across the tire and wheel, directly across the center.

Example: 6.053 in x 2 = 12.106 in

Add the combined section heights of the tire (12.106 in) to the wheel size to get the combined

diameter of the tire and wheel.

15 in + 12.106 in = 27.106 in

Section Height

Section Height = Section Width x Aspect Ratio

Tire and Wheel Diameters

Total Diameter = (Section Height x 2) + Wheel Diameter

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Exceptions

Not every trailer tire will have a size like the example above. We also offer sizes such as 4.80-12 that

do not automatically include all the information you need to determine the total tire and wheel

diameter.

In the case of a size like 4.80-12, 4.80 is the section width of the tire in inches. The final number

indicates the wheel diameter, similar to the more common tire size notation. If the first number of the

size is 3 or 4 digits separated by a decimal point, you need to look at the las t digit to determine the

aspect ratio.

For numbers that end in 0, the aspect ratio is 92 percent. Numbers that do not end in 0 have an

aspect ratio of 82 percent.

Example: 4.80 in x 0.92 = 4.416 in

A 4.80-12 tire has a section width of 4.8 inches, a section height of 4.416 inches and a wheel diameter of 12 inches. The combined diameter of

the tire and wheel assembly is 20.832 inches.

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