185/45R15 in Inches

A 185/45R15 tire has a 21.6-inch diameter, a 7.3-inch width, and is designed for a 15-inch rim.

In high flotation terms, this tire is labeled as 21.6x7.3R15.

185/45R15 Tire Size
185/45R15 Tire Size in Inches
185/45R15 Tire Circumference
935.7 revs/mile

185/45R15 Tire Overview

21.6 inches
Wheel Diameter
15 inches
Tire Width
7.3 inches
67.7 inches
Sidewall Height
3.3 inches
935.7 per mile

What does 185/45R15 mean?

185/45R15 tire size meaning in inches

185/45R15 is a tire size with the following dimensions:

  • 185 is the width of the tire in millimeters. This number also indicates the appropriate width of the rim on which the tire should be mounted.
  • 45 is the aspect ratio, which is the ratio of the tire's height to its width. This affects the tire's handling and ride comfort
  • R indicates the tire's construction type, meaning it has a radial construction. This provides stability and precision to the tire.
  • 15 is the diameter of the wheel in inches, on which the tire is to be mounted.

185/45R15 Tire Conversion

Tire Diameter21.6 in547.5 mm
Section Width7.3 in185 mm
Rim Height15 in381 mm
Sidewall Height3.3 in83.3 mm
Circumference67.7 in1720 mm
Revolutions935.7 revs/mile
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FAQ About 185/45R15 Tire

How tall is a 185/45R15 tire?

The height (or diameter) of a 185/45R15 tire is 21.6 inches

How wide is a 185/45R15 tire?

The width of a 185/45R15 tire is 185 mm, which is about 7.3 inches.

What size rim fits a 185/45R15 tire?

A 185/45R15 tire fits on a rim that is 15 inches in diameter.

What does the 45 in a 185/45R15 tire mean?

The 45 in a 185/45R15 tire refers to the aspect ratio, meaning the height of the tire's sidewall is 45% of its width.

Alternative Tire Sizes for 185/45R15

Typically, it's recommended to choose a tire with a diameter (height) within 3% of the original equipment manufacturer (OEM) tire size.

However, keep in mind that this is a general guideline and not an absolute rule.

Here are some tire sizes that are compatible with the 185/45R15:

Tire SizeDiameterRim
115/70R1521.3″ (-1.4%)15 x n/a
125/70R1521.9″ (1.4%)15 x n/a
165/50R1521.5″ (-0.5%)15 x 4.5-6.0
165/55R1522.1″ (2.3%)15 x 4.5-6.0
175/50R1521.9″ (1.4%)15 x 5.0-6.0
195/45R1521.9″ (1.4%)15 x 6.0-7.5
215/40R1521.8″ (0.9%)15 x 7.0-8.5
245/35R1521.8″ (0.9%)15 x 8.0-9.5