325/30R23 Tire Size in Inches & Millimeters

Tire size “325/30R23” indicates your vehicle’s specifications based on tire width, aspect ratio, height, tire construction, diameter, radial and inches. These tire size numbers represent our tire sizes in both Metric (in millimeters) and Imperial (in inches) units of measurement to help find the correct tire size for your vehicle.

To convert tire size 325/30R23 to inches, you must know what these numbers represent.

So let us know 325/30R23 in simple words:

First number “325” indicates the tire’s width in millimeters.
Second number “30” refers to the aspect ratio, which is the height of the tire’s sidewall as a percentage of its width.
Third number “R23” refers to a tire that is designed to fit a 23-inch diameter rim.

Therefore, when converting the tire size 325/30R23 to inches, it can be concluded that the width of the tire will be approximately 12.8 inches ( 325 mm= 12.8 in), and the sidewall height will be approximately 3.9 inches (30% of 12.8 inches = 3.9 inches).

How to convert 325/30R23 into Inches (imperial)?

To convert tire size 325/30R23 to inches (Imperial) –

1. Width conversion: To convert it to inches, you can use a conversion factor of approximately 25.4 millimeters per inch.

  • 325 millimeters/25.4 = approximately 12.8 inches
    So, the width of the tire is approximately 12.8 inches.

2. Aspect Ratio Calculation: To calculate sidewall height in inches, you can use the tire width (from Step 1) and the aspect ratio:

  • Sidewall Height = Width (in inches) * Aspect Ratio / 100
  • Sidewall Height = 12.8 inches * 30/100 = approximately 3.9 inches
    So, the tire sidewall height is approximately 3.9 inches.

3. Rim Diameter: The “R” in the tire size stands for “radial construction” and the last number “23” indicates the rim diameter in inches. In this case, it’s already in inches.
So, the converted tire size “325/30R23” in inches (imperial) is approximately:

  • Width: 12.8 inches
  • Sidewall Height: 3.9 inches
  • Rim Diameter: 23 inches

How to convert 325/30R23 into Millimeters (metric)?

To convert the tire size 325/30R23 into millimeters (metric) –

1. Width Conversion: The first number in the tire size, “325“, represents the tire’s width in millimeters. Since it’s already in millimeters, there’s no need for conversion.

  • Width: 325millimeters

2. Aspect Ratio Calculation: The second number “30” is the aspect ratio, representing the tire’s sidewall height as a percentage of its width. To calculate the sidewall height in millimeters, you can use the tire’s width (from step 1) and the aspect ratio:

  • Sidewall height = Width (in millimeters) * Aspect Ratio / 100
  • Sidewall height = 325 millimeters * 30 / 100 = 98 mm millimeters
    So, the tire’s sidewall height is approximately 98 mm millimeters.

3. Rim Diameter: The “R” in the tire size stands for “radial construction” and the last number, “23” indicates the rim diameter in inches. To convert this to millimeters, you can use the conversion factor of approximately 25.4 millimeters per inch.

  • Rim diameter = 23 inches * 25.4 millimeters per inch = 584 mm millimeters
    So, the rim diameter is approximately 584 mm millimeters.

So, the converted tire size “325/30R23” in millimeters (metric) is approximately:

  • Width: 325 mm
  • Sidewall Height: 98 mm
  • Rim Diameter: 584 mm

Alternate Tire Size of 325/30R23 For replacement

Tire Size Overall Diameter Difference
245/30R24 29.8″ (758 mm) -2.8%
295/30R23 30″ (762 mm) -2.3%
255/30R24 30.1″ (764 mm) -2.1%
275/30R24 30.6″ (776 mm) -0.5%
285/30R24 30.8″ (782 mm) 0.3%
285/35R23 30.9″ (784 mm) 0.5%
295/30R24 31″ (788 mm) 1%
355/25R24 31″ (788 mm) 1%
295/35R23 31.1″ (790 mm) 1.3%
305/35R23 31.4″ (798 mm) 2.3%
315/30R24 31.5″ (800 mm) 2.6%

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