275/40R18 in inches

How tall is a 275 40R18 tire?

When converted to inches, the equivalent of a 275/40R18 tire size is 26.6x10.8R18. It means that:

  • height overall (or diameter) is 26.6 inches
  • tread width is 10.8 inches
  • wheel diameter is 18 inches

Learn more

275/40R18 tire size in inches
275/40R18 tire size chart

275/40R18 tire size in inches

275/40R18 Height / overall diameter: 26.6 inches
Height / overall diameter
26.6 inches
275/40R18 Tread width: 10.8 inches
Tread width
10.8 inches
275/40R18 Sidewall: 4.3 inches
Sidewall
4.3 inches
275/40R18 Wheel diameter: 18 inches
Wheel diameter
18 inches
275/40R18 Circumference: 83.5 inches
Circumference
83.5 inches
275/40R18 Revolutions: 758 per mile
Revolutions
758 per mile

275/40R18 — what does it mean?

  • 275 stands for tread width in millimeters
  • 40 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

275/40R18 tire code
275/40R18 tire code

How to convert 275 40R18 to inches?

First of all, we need to divide 275 mm (width) by 25.4 (mm to inch conversion), which will give us a width of 10.8″. Then, 40% of the 10.8″ will result in 4.3″ 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 26.6″ total tire diameter (or height).

For your convenience, below is a table for 275/40R18 conversion to inches:

Inches Metric
Overall diameter (height) 26.6″ 676 mm
Tread width 10.8″ 275 mm
Wheel diameter 18″ 676 mm
Sidewall height 4.3″ 110 mm
Circumference 83.5″ 2123 mm
Revolutions 758 / ml 471 / km

Alternatives to a 275/40R18 tire

If you're looking to upsize your 275 40R18 tires, try to stay within 3% deviation of an overall diameter for safety reasons.

Tire Tire diameter Width Wheel Size
245/45R18 26.6″ 0% 9.6″ 18″
235/45R18 26.4″ -0.19% 9.3″ 18″
135/80R18 26.6″ 0% 5.3″ 18″
145/70R18 26″ -0.6% 5.7″ 18″
145/80R18 27.2″ 0.55% 5.7″ 18″
155/70R18 26.6″ 0% 6.1″ 18″
165/70R18 27.2″ 0.55% 6.5″ 18″
185/55R18 26″ -0.6% 7.3″ 18″
T185/55R18 26″ -0.6% 7.3″ 18″
205/55R18 26.8″ 0.18% 8.1″ 18″