245/30R18 in inches

How tall is a 245 30R18 tire?

When converted to inches, the equivalent of a 245/30R18 tire size is 23.8x9.6R18. It means that:

  • height overall (or diameter) is 23.8 inches
  • tread width is 9.6 inches
  • wheel diameter is 18 inches

Learn more

245/30R18 tire size in inches
245/30R18 tire size chart

245/30R18 tire size in inches

245/30R18 Height / overall diameter: 23.8 inches
Height / overall diameter
23.8 inches
245/30R18 Tread width: 9.6 inches
Tread width
9.6 inches
245/30R18 Sidewall: 2.9 inches
Sidewall
2.9 inches
245/30R18 Wheel diameter: 18 inches
Wheel diameter
18 inches
245/30R18 Circumference: 74.7 inches
Circumference
74.7 inches
245/30R18 Revolutions: 847 per mile
Revolutions
847 per mile

245/30R18 — what does it mean?

  • 245 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

245/30R18 tire code
245/30R18 tire code

How to convert 245 30R18 to inches?

First of all, we need to divide 245 mm (width) by 25.4 (mm to inch conversion), which will give us a width of 9.6″. Then, 30% of the 9.6″ will result in 2.9″ 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 23.8″ total tire diameter (or height).

For your convenience, below is a table for 245/30R18 conversion to inches:

Inches Metric
Overall diameter (height) 23.8″ 605 mm
Tread width 9.6″ 245 mm
Wheel diameter 18″ 605 mm
Sidewall height 2.9″ 74 mm
Circumference 74.7″ 1900 mm
Revolutions 847 / ml 526 / km

Alternatives to a 245/30R18 tire

If you're looking to upsize your 245 30R18 tires, try to stay within 3% deviation of an overall diameter for safety reasons.

Tire Tire diameter Width Wheel Size
125/60R18 24″ 0.21% 4.9″ 18″
135/60R18 24.4″ 0.61% 5.3″ 18″
165/40R18 23.2″ -0.67% 6.5″ 18″
175/45R18 24.2″ 0.41% 6.9″ 18″
195/35R18 23.4″ -0.46% 7.7″ 18″
205/35R18 23.6″ -0.25% 8.1″ 18″
205/40R18 24.4″ 0.61% 8.1″ 18″
215/35R18 24″ 0.21% 8.5″ 18″
225/30R18 23.4″ -0.46% 8.9″ 18″
225/35R18 24.2″ 0.41% 8.9″ 18″