205/65R15 Tire Size in Inches & Millimeters

Tire size “205/65R15” 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 205/65R15 to inches, you must know what these numbers represent.

So let us know 205/65R15 in simple words:

First number “205” indicates the tire’s width in millimeters.
Second number “65” refers to the aspect ratio, which is the height of the tire’s sidewall as a percentage of its width.
Third number “R15” refers to a tire that is designed to fit a 15-inch diameter rim.

Therefore, when converting the tire size 205/65R15 to inches, it can be concluded that the width of the tire will be approximately 8.1 inches ( 205 mm= 8.1 in), and the sidewall height will be approximately 5.2 inches (65% of 8.1 inches = 5.2 inches).

How to convert 205/65R15 into Inches (imperial)?

To convert tire size 205/65R15 to inches (Imperial) –

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

  • 205 millimeters/25.4 = approximately 8.1 inches
    So, the width of the tire is approximately 8.1 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 = 8.1 inches * 65/100 = approximately 5.2 inches
    So, the tire sidewall height is approximately 5.2 inches.

3. Rim Diameter: The “R” in the tire size stands for “radial construction” and the last number “15” indicates the rim diameter in inches. In this case, it’s already in inches.
So, the converted tire size “205/65R15” in inches (imperial) is approximately:

  • Width: 8.1 inches
  • Sidewall Height: 5.2 inches
  • Rim Diameter: 15 inches

How to convert 205/65R15 into Millimeters (metric)?

To convert the tire size 205/65R15 into millimeters (metric) –

1. Width Conversion: The first number in the tire size, “205“, represents the tire’s width in millimeters. Since it’s already in millimeters, there’s no need for conversion.

  • Width: 205millimeters

2. Aspect Ratio Calculation: The second number “65” 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 = 205 millimeters * 65 / 100 = 133 mm millimeters
    So, the tire’s sidewall height is approximately 133 mm millimeters.

3. Rim Diameter: The “R” in the tire size stands for “radial construction” and the last number, “15” 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 = 15 inches * 25.4 millimeters per inch = 381 mm millimeters
    So, the rim diameter is approximately 381 mm millimeters.

So, the converted tire size “205/65R15” in millimeters (metric) is approximately:

  • Width: 205 mm
  • Sidewall Height: 133 mm
  • Rim Diameter: 381 mm

Alternate Tire Size of 205/65R15 For replacement

Tire Size Overall Diameter Difference
185/60R16 24.7″ (628 mm) -2.9%
195/50R17 24.7″ (628 mm) -2.9%
245/40R17 24.7″ (628 mm) -2.9%
155R15 24.8″ (629 mm) -2.8%
225/55R15 24.8″ (629 mm) -2.8%
155/80R15 24.8″ (629 mm) -2.8%
285/35R17 24.9″ (632 mm) -2.3%
225/50R16 24.9″ (632 mm) -2.3%
205/55R16 24.9″ (632 mm) -2.3%
125/90R16 24.9″ (632 mm) -2.3%
125/80R17 24.9″ (632 mm) -2.3%
225/45R17 25″ (634 mm) -2%
195/65R15 25″ (635 mm) -1.9%
255/40R17 25″ (636 mm) -1.7%
145/70R17 25″ (636 mm) -1.7%
145/80R16 25.1″ (638 mm) -1.4%
295/35R17 25.1″ (638 mm) -1.4%
205/50R17 25.1″ (638 mm) -1.4%
235/55R15 25.2″ (639 mm) -1.2%
215/60R15 25.2″ (639 mm) -1.2%
195/60R16 25.2″ (640 mm) -1.1%
185/70R15 25.2″ (641 mm) -0.9%
215/55R16 25.3″ (642 mm) -0.8%
235/50R16 25.3″ (642 mm) -0.8%
175/75R15 25.3″ (643 mm) -0.6%
235/45R17 25.4″ (644 mm) -0.5%
265/45R16 25.4″ (644 mm) -0.5%
265/40R17 25.4″ (644 mm) -0.5%
165/80R15 25.4″ (645 mm) -0.3%
165R15 25.4″ (645 mm) -0.3%
185/65R16 25.4″ (646 mm) -0.2%
305/35R17 25.4″ (646 mm) -0.2%
195/55R17 25.4″ (646 mm) -0.2%
265/50R15 25.5″ (647 mm) 0%
135/80R17 25.5″ (648 mm) 0.2%
215/50R17 25.5″ (648 mm) 0.2%
155/70R17 25.6″ (650 mm) 0.5%
135/90R16 25.6″ (650 mm) 0.5%
115/95R17 25.6″ (650 mm) 0.5%
225/60R15 25.6″ (651 mm) 0.6%
275/40R17 25.7″ (652 mm) 0.8%
245/45R17 25.7″ (652 mm) 0.8%
315/35R17 25.7″ (652 mm) 0.8%
205/60R16 25.7″ (652 mm) 0.8%
245/50R16 25.7″ (652 mm) 0.8%
185/60R17 25.7″ (654 mm) 1.1%
155/80R16 25.7″ (654 mm) 1.1%
225/55R16 25.7″ (654 mm) 1.1%
275/45R16 25.7″ (654 mm) 1.1%
195/70R15 25.8″ (655 mm) 1.2%
275/50R15 25.9″ (657 mm) 1.5%
205/55R17 25.9″ (658 mm) 1.7%
225/50R17 25.9″ (658 mm) 1.7%
315/40R16 25.9″ (658 mm) 1.7%
285/40R17 26″ (660 mm) 2%
195/65R16 26″ (660 mm) 2%
215/65R15 26″ (661 mm) 2.2%
255/55R15 26″ (661 mm) 2.2%
255/50R16 26.1″ (662 mm) 2.3%
255/45R17 26.1″ (662 mm) 2.3%
235/60R15 26.1″ (663 mm) 2.5%
165/70R17 26.1″ (664 mm) 2.6%
215/60R16 26.1″ (664 mm) 2.6%
145/80R17 26.1″ (664 mm) 2.6%
235/55R16 26.1″ (664 mm) 2.6%
335/35R17 26.2″ (666 mm) 2.9%

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