225/30R18 in inches

How tall is a 225 30R18 tire?

When converted to inches, the equivalent of a 225/30R18 tire size is 23.4x8.9R18. It means that:

  • height overall (or diameter) is 23.4 inches
  • tread width is 8.9 inches
  • wheel diameter is 18 inches

Learn more

225/30R18 tire size in inches
225/30R18 tire size chart

225/30R18 tire size in inches

225/30R18 Height / overall diameter: 23.4 inches
Height / overall diameter
23.4 inches
225/30R18 Tread width: 8.9 inches
Tread width
8.9 inches
225/30R18 Sidewall: 2.7 inches
Sidewall
2.7 inches
225/30R18 Wheel diameter: 18 inches
Wheel diameter
18 inches
225/30R18 Circumference: 73.5 inches
Circumference
73.5 inches
225/30R18 Revolutions: 863 per mile
Revolutions
863 per mile

225/30R18 — what does it mean?

  • 225 stands for tread width in millimeters
  • 30 is an aspect ration between the tread width and the sidewall in percents
  • R means that the tire has a radial construction
  • 18 is a wheel diameter (or rim) in inches

225/30R18 tire code
225/30R18 tire code

How to convert 225 30R18 to inches?

First of all, we need to divide 225 mm (width) by 25.4 (mm to inch conversion), which will give us a width of 8.9″. Then, 30% of the 8.9″ will result in 2.7″ sidewall.

To get the total height or tire diameter, we need to sum the 18″ rim diameter with two of the sidewall heights. It will result in a 23.4″ total tire diameter (or height).

For your convenience, below is a table for 225/30R18 conversion to inches:

Inches Metric
Overall diameter (height) 23.4″ 594 mm
Tread width 8.9″ 225 mm
Wheel diameter 18″ 594 mm
Sidewall height 2.7″ 68 mm
Circumference 73.5″ 1865 mm
Revolutions 863 / ml 536 / km

Alternatives to a 225/30R18 tire

If you're looking to upsize your 225 30R18 tires, try to stay within 3% deviation of an overall diameter for safety reasons.

Tire Tire diameter Width Wheel Size
125/60R18 24″ 0.66% 4.9″ 18″
165/40R18 23.2″ -0.21% 6.5″ 18″
195/35R18 23.4″ 0% 7.7″ 18″
205/35R18 23.6″ 0.21% 8.1″ 18″
215/35R18 24″ 0.66% 8.5″ 18″
235/30R18 23.6″ 0.21% 9.3″ 18″
245/30R18 23.8″ 0.46% 9.6″ 18″
255/30R18 24″ 0.66% 10″ 18″
P215/35R18 24″ 0.66% 8.5″ 18″