LT345/75R16 Tire Size in Inches & Millimeters

Tire size “345/75R16” 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 LT345/75R16 to inches, you must know what these numbers represent.

So let us know LT345/75R16 in simple words:

First number “345” indicates the tire’s width in millimeters.
Second number “75” refers to the aspect ratio, which is the height of the tire’s sidewall as a percentage of its width.
Third number “R16” refers to a tire that is designed to fit a 16-inch diameter rim.

Therefore, when converting the tire size LT345/75R16 to inches, it can be concluded that the width of the tire will be approximately 13.6 inches ( 345 mm= 13.6 in), and the sidewall height will be approximately 10.2 inches (75% of 13.6 inches = 10.2 inches).

How to convert LT345/75R16 into Inches (imperial)?

To convert tire size LT345/75R16 to inches (Imperial) –

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

  • 345 millimeters/25.4 = approximately 13.6 inches
    So, the width of the tire is approximately 13.6 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 = 13.6 inches * 75/100 = approximately 10.2 inches
    So, the tire sidewall height is approximately 10.2 inches.

3. Rim Diameter: The “R” in the tire size stands for “radial construction” and the last number “16” indicates the rim diameter in inches. In this case, it’s already in inches.
So, the converted tire size “LT345/75R16” in inches (imperial) is approximately:

  • Width: 13.6 inches
  • Sidewall Height: 10.2 inches
  • Rim Diameter: 16 inches

How to convert LT345/75R16 into Millimeters (metric)?

To convert the tire size LT345/75R16 into millimeters (metric) –

1. Width Conversion: The first number in the tire size, “345“, represents the tire’s width in millimeters. Since it’s already in millimeters, there’s no need for conversion.

  • Width: 345millimeters

2. Aspect Ratio Calculation: The second number “75” 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 = 345 millimeters * 75 / 100 = 259 mm millimeters
    So, the tire’s sidewall height is approximately 259 mm millimeters.

3. Rim Diameter: The “R” in the tire size stands for “radial construction” and the last number, “16” 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 = 16 inches * 25.4 millimeters per inch = 406 mm millimeters
    So, the rim diameter is approximately 406 mm millimeters.

So, the converted tire size “LT345/75R16” in millimeters (metric) is approximately:

  • Width: 345 mm
  • Sidewall Height: 259 mm
  • Rim Diameter: 406 mm

Alternate Tire Size of LT345/75R16 For replacement

Tire Size Overall Diameter Difference
275/80R18 35.3″ (897 mm) -2.9%
315/70R18 35.4″ (899 mm) -2.7%
355/70R16 35.6″ (904 mm) -2.2%
375/60R18 35.7″ (907 mm) -1.8%
305/75R18 36″ (915 mm) -1%
365/70R16 36.1″ (918 mm) -0.6%
355/65R18 36.2″ (919 mm) -0.5%
325/80R16 36.5″ (926 mm) 0.2%
355/70R17 36.6″ (930 mm) 0.6%
385/70R16 37.2″ (946 mm) 2.4%

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