305/30R18 in Inches

A 305/30R18 tire has a 25.2-inch diameter, a 12-inch width, and is designed for a 18-inch rim.

In high flotation terms, this tire is labeled as 25.2x12R18.

305/30R18 Tire Size
12"
25.2"
305/30R18 Tire Size in Inches
305/30R18 Tire Circumference
79.2"
18"
3.6"
800.2 revs/mile

305/30R18 Tire Overview

Height
25.2 inches
Wheel Diameter
18 inches
Tire Width
12 inches
Circumference
79.2 inches
Sidewall Height
3.6 inches
Revolutions
800.2 per mile
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What does 305/30R18 mean?

305/30R18 tire size meaning in inches

305/30R18 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.
  • 30 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.

305/30R18 Tire Conversion

DimensionsInchesMillimeters
Tire Diameter25.2 in640.2 mm
Section Width12 in305 mm
Rim Height18 in457 mm
Sidewall Height3.6 in91.5 mm
Circumference79.2 in2011.2 mm
Revolutions800.2 revs/mile
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FAQ About 305/30R18 Tire

How tall is a 305/30R18 tire?

The height (or diameter) of a 305/30R18 tire is 25.2 inches

How wide is a 305/30R18 tire?

The width of a 305/30R18 tire is 305 mm, which is about 12 inches.

What size rim fits a 305/30R18 tire?

A 305/30R18 tire fits on a rim that is 18 inches in diameter.

What does the 30 in a 305/30R18 tire mean?

The 30 in a 305/30R18 tire refers to the aspect ratio, meaning the height of the tire's sidewall is 30% of its width.

Alternative Tire Sizes for 305/30R18

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 305/30R18:

Tire SizeDiameterRim
125/70R1824.9″ (-1.2%)18 x n/a
135/70R1825.4″ (0.8%)18 x n/a
145/65R1825.4″ (0.8%)18 x n/a
155/60R1825.3″ (0.4%)18 x n/a
205/40R1824.5″ (-2.8%)18 x 7.0-8.0
205/45R1825.3″ (0.4%)18 x 6.5-7.5
215/40R1824.8″ (-1.6%)18 x 7.0-8.5
215/45R1825.6″ (1.6%)18 x 7.0-8.0
225/40R1825.1″ (-0.4%)18 x 7.5-9.0
235/35R1824.5″ (-2.8%)18 x 8.0-9.5
235/40R1825.4″ (0.8%)18 x 8.0-9.5
245/35R1824.8″ (-1.6%)18 x 8.0-9.5
245/40R1825.7″ (2.0%)18 x 8.0-9.5
255/35R1825.0″ (-0.8%)18 x 8.5-10.0
265/35R1825.3″ (0.4%)18 x 9.0-10.5
275/35R1825.6″ (1.6%)18 x 9.0-11.0
285/30R1824.7″ (-2.0%)18 x 9.5-10.5
285/35R1825.9″ (2.8%)18 x 9.5-11.0
295/30R1825.0″ (-0.8%)18 x 10.0-11.0
315/30R1825.4″ (0.8%)18 x 10.5-11.5
335/30R1825.9″ (2.8%)18 x 11.5-12.5