175/65R15 Tire Size in Inches & Millimeters

Tire size “175/65R15” 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 175/65R15 to inches, you must know what these numbers represent.

So let us know 175/65R15 in simple words:

First number “175” 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 175/65R15 to inches, it can be concluded that the width of the tire will be approximately 6.9 inches ( 175 mm= 6.9 in), and the sidewall height will be approximately 4.5 inches (65% of 6.9 inches = 4.5 inches).

How to convert 175/65R15 into Inches (imperial)?

To convert tire size 175/65R15 to inches (Imperial) –

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

  • 175 millimeters/25.4 = approximately 6.9 inches
    So, the width of the tire is approximately 6.9 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 = 6.9 inches * 65/100 = approximately 4.5 inches
    So, the tire sidewall height is approximately 4.5 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 “175/65R15” in inches (imperial) is approximately:

  • Width: 6.9 inches
  • Sidewall Height: 4.5 inches
  • Rim Diameter: 15 inches

How to convert 175/65R15 into Millimeters (metric)?

To convert the tire size 175/65R15 into millimeters (metric) –

1. Width Conversion: The first number in the tire size, “175“, represents the tire’s width in millimeters. Since it’s already in millimeters, there’s no need for conversion.

  • Width: 175millimeters

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 = 175 millimeters * 65 / 100 = 114 mm millimeters
    So, the tire’s sidewall height is approximately 114 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 “175/65R15” in millimeters (metric) is approximately:

  • Width: 175 mm
  • Sidewall Height: 114 mm
  • Rim Diameter: 381 mm

Alternate Tire Size of 175/65R15 For replacement

Tire Size Overall Diameter Difference
175/60R15 23.3″ (591 mm) -3%
185/50R16 23.3″ (592 mm) -2.8%
235/45R15 23.3″ (593 mm) -2.6%
165/65R15 23.4″ (595 mm) -2.3%
195/55R15 23.4″ (595 mm) -2.3%
135/70R16 23.5″ (596 mm) -2.1%
205/40R17 23.5″ (596 mm) -2.1%
215/50R15 23.5″ (597 mm) -2%
135/80R15 23.5″ (597 mm) -2%
175/55R16 23.5″ (598 mm) -1.8%
155/70R15 23.6″ (599 mm) -1.6%
215/45R16 23.6″ (600 mm) -1.5%
195/50R16 23.7″ (602 mm) -1.1%
185/60R15 23.7″ (603 mm) -1%
215/40R17 23.8″ (604 mm) -0.8%
245/35R17 23.8″ (604 mm) -0.8%
125/80R16 23.9″ (606 mm) -0.5%
225/50R15 23.9″ (607 mm) -0.3%
205/55R15 23.9″ (607 mm) -0.3%
125/90R15 23.9″ (607 mm) -0.3%
225/45R16 23.9″ (608 mm) -0.2%
125/70R17 23.9″ (608 mm) -0.2%
195/45R17 23.9″ (608 mm) -0.2%
285/40R15 24″ (609 mm) 0%
185/55R16 24″ (610 mm) 0.2%
255/45R15 24.1″ (611 mm) 0.3%
225/40R17 24.1″ (612 mm) 0.5%
205/50R16 24.1″ (612 mm) 0.5%
195/60R15 24.2″ (615 mm) 1%
205/45R17 24.3″ (616 mm) 1.1%
175/60R16 24.3″ (616 mm) 1.1%
215/55R15 24.3″ (617 mm) 1.3%
235/50R15 24.3″ (617 mm) 1.3%
185/50R17 24.3″ (618 mm) 1.5%
125/85R16 24.3″ (618 mm) 1.5%
265/35R17 24.3″ (618 mm) 1.5%
235/40R17 24.4″ (620 mm) 1.8%
195/55R16 24.4″ (620 mm) 1.8%
185/65R15 24.4″ (621 mm) 2%
135/70R17 24.5″ (622 mm) 2.1%
215/50R16 24.5″ (622 mm) 2.1%
135/80R16 24.5″ (622 mm) 2.1%
345/35R15 24.5″ (623 mm) 2.3%
275/35R17 24.6″ (624 mm) 2.5%
175/55R17 24.6″ (624 mm) 2.5%
135/90R15 24.6″ (625 mm) 2.6%
215/45R17 24.6″ (626 mm) 2.8%
245/45R16 24.6″ (626 mm) 2.8%
245/50R15 24.7″ (627 mm) 3%
175/70R15 24.7″ (627 mm) 3%
205/60R15 24.7″ (627 mm) 3%

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