255/50R16 Tire Size in Inches & Millimeters

Tire size “255/50R16” 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 255/50R16 to inches, you must know what these numbers represent.

So let us know 255/50R16 in simple words:

First number “255” indicates the tire’s width in millimeters.
Second number “50” 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 255/50R16 to inches, it can be concluded that the width of the tire will be approximately 10 inches ( 255 mm= 10 in), and the sidewall height will be approximately 5 inches (50% of 10 inches = 5 inches).

How to convert 255/50R16 into Inches (imperial)?

To convert tire size 255/50R16 to inches (Imperial) –

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

  • 255 millimeters/25.4 = approximately 10 inches
    So, the width of the tire is approximately 10 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 = 10 inches * 50/100 = approximately 5 inches
    So, the tire sidewall height is approximately 5 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 “255/50R16” in inches (imperial) is approximately:

  • Width: 10 inches
  • Sidewall Height: 5 inches
  • Rim Diameter: 16 inches

How to convert 255/50R16 into Millimeters (metric)?

To convert the tire size 255/50R16 into millimeters (metric) –

1. Width Conversion: The first number in the tire size, “255“, represents the tire’s width in millimeters. Since it’s already in millimeters, there’s no need for conversion.

  • Width: 255millimeters

2. Aspect Ratio Calculation: The second number “50” 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 = 255 millimeters * 50 / 100 = 128 mm millimeters
    So, the tire’s sidewall height is approximately 128 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 “255/50R16” in millimeters (metric) is approximately:

  • Width: 255 mm
  • Sidewall Height: 128 mm
  • Rim Diameter: 406 mm

Alternate Tire Size of 255/50R16 For replacement

Tire Size Overall Diameter Difference
155/60R18 25.3″ (643 mm) -2.9%
265/35R18 25.3″ (643 mm) -2.9%
235/45R17 25.4″ (644 mm) -2.7%
265/45R16 25.4″ (644 mm) -2.7%
265/40R17 25.4″ (644 mm) -2.7%
145/65R18 25.4″ (645 mm) -2.6%
235/40R18 25.4″ (645 mm) -2.6%
195/55R17 25.4″ (646 mm) -2.4%
185/65R16 25.4″ (646 mm) -2.4%
305/35R17 25.4″ (646 mm) -2.4%
315/30R18 25.5″ (647 mm) -2.3%
135/70R18 25.5″ (647 mm) -2.3%
215/50R17 25.5″ (648 mm) -2.1%
135/80R17 25.5″ (648 mm) -2.1%
275/35R18 25.6″ (649 mm) -2%
155/70R17 25.6″ (650 mm) -1.8%
115/95R17 25.6″ (650 mm) -1.8%
135/90R16 25.6″ (650 mm) -1.8%
215/45R18 25.6″ (651 mm) -1.7%
275/40R17 25.7″ (652 mm) -1.5%
205/60R16 25.7″ (652 mm) -1.5%
245/45R17 25.7″ (652 mm) -1.5%
245/50R16 25.7″ (652 mm) -1.5%
315/35R17 25.7″ (652 mm) -1.5%
245/40R18 25.7″ (653 mm) -1.4%
185/60R17 25.7″ (654 mm) -1.2%
155/80R16 25.7″ (654 mm) -1.2%
225/55R16 25.7″ (654 mm) -1.2%
275/45R16 25.7″ (654 mm) -1.2%
285/35R18 25.9″ (657 mm) -0.8%
205/55R17 25.9″ (658 mm) -0.6%
315/40R16 25.9″ (658 mm) -0.6%
225/50R17 25.9″ (658 mm) -0.6%
335/30R18 25.9″ (659 mm) -0.5%
225/45R18 25.9″ (659 mm) -0.5%
285/40R17 26″ (660 mm) -0.3%
195/65R16 26″ (660 mm) -0.3%
255/40R18 26″ (661 mm) -0.2%
185/55R18 26″ (661 mm) -0.2%
145/70R18 26″ (661 mm) -0.2%
255/45R17 26.1″ (662 mm) 0%
295/35R18 26.1″ (663 mm) 0.2%
205/50R18 26.1″ (663 mm) 0.2%
145/80R17 26.1″ (664 mm) 0.3%
235/55R16 26.1″ (664 mm) 0.3%
215/60R16 26.1″ (664 mm) 0.3%
165/70R17 26.1″ (664 mm) 0.3%
345/30R18 26.2″ (665 mm) 0.5%
335/35R17 26.2″ (666 mm) 0.6%
145/90R16 26.3″ (668 mm) 0.9%
215/55R17 26.3″ (668 mm) 0.9%
175/75R16 26.3″ (668 mm) 0.9%
295/40R17 26.3″ (668 mm) 0.9%
235/50R17 26.3″ (668 mm) 0.9%
235/45R18 26.3″ (669 mm) 1.1%
265/40R18 26.3″ (669 mm) 1.1%
165/80R16 26.4″ (670 mm) 1.2%
240/55R16 26.4″ (670 mm) 1.2%
305/35R18 26.4″ (671 mm) 1.4%
205/65R16 26.5″ (672 mm) 1.5%
265/50R16 26.5″ (672 mm) 1.5%
135/80R18 26.5″ (673 mm) 1.7%
215/50R18 26.5″ (673 mm) 1.7%
155/70R18 26.6″ (675 mm) 2%
225/60R16 26.6″ (676 mm) 2.1%
135/90R17 26.6″ (676 mm) 2.1%
245/55R16 26.6″ (676 mm) 2.1%
275/40R18 26.7″ (677 mm) 2.3%
315/35R18 26.7″ (677 mm) 2.3%
245/45R18 26.7″ (677 mm) 2.3%
205/60R17 26.7″ (678 mm) 2.4%
245/50R17 26.7″ (678 mm) 2.4%
225/55R17 26.8″ (680 mm) 2.7%
155/80R17 26.8″ (680 mm) 2.7%

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