305/65R18 in Inches

A 305/65R18 tire has a 33.6-inch diameter, a 12-inch width, and is designed for a 18-inch rim.

In high flotation terms, this tire is labeled as 33.6x12R18.

305/65R18 Tire Size
12"
33.6"
305/65R18 Tire Size in Inches
305/65R18 Tire Circumference
105.6"
18"
7.8"
600.1 revs/mile

305/65R18 Tire Overview

Height
33.6 inches
Wheel Diameter
18 inches
Tire Width
12 inches
Circumference
105.6 inches
Sidewall Height
7.8 inches
Revolutions
600.1 per mile
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What does 305/65R18 mean?

305/65R18 tire size meaning in inches

305/65R18 is a tire size with the following dimensions:

  • 305 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.
  • 65 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.
  • 18 is the diameter of the wheel in inches, on which the tire is to be mounted.

305/65R18 Tire Conversion

DimensionsInchesMillimeters
Tire Diameter33.6 in853.7 mm
Section Width12 in305 mm
Rim Height18 in457 mm
Sidewall Height7.8 in198.3 mm
Circumference105.6 in2682 mm
Revolutions600.1 revs/mile
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FAQ About 305/65R18 Tire

How tall is a 305/65R18 tire?

The height (or diameter) of a 305/65R18 tire is 33.6 inches

How wide is a 305/65R18 tire?

The width of a 305/65R18 tire is 305 mm, which is about 12 inches.

What size rim fits a 305/65R18 tire?

A 305/65R18 tire fits on a rim that is 18 inches in diameter.

What does the 65 in a 305/65R18 tire mean?

The 65 in a 305/65R18 tire refers to the aspect ratio, meaning the height of the tire's sidewall is 65% of its width.

Alternative Tire Sizes for 305/65R18

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 305/65R18:

Tire SizeDiameterRim
265/70R1832.6″ (-3.0%)18 x 7.0-9.0
275/70R1833.2″ (-1.2%)18 x 7.0-8.5
285/65R1832.6″ (-3.0%)18 x 8.0-10.0
285/70R1833.7″ (0.3%)18 x 7.5-9.5
295/65R1833.1″ (-1.5%)18 x 8.0-10.0
295/70R1834.3″ (2.1%)18 x 7.0-10.0
325/60R1833.4″ (-0.6%)18 x 8.5-10.0
325/65R1834.6″ (3.0%)18 x 9.0-10.0
345/60R1834.3″ (2.1%)18 x n/a
375/50R1832.8″ (-2.4%)18 x n/a