T185/55R18 in inches

How tall is a T185 55R18 tire?

When converted to inches, the equivalent of a T185/55R18 tire size is 26x7.3R18. It means that:

  • height overall (or diameter) is 26 inches
  • tread width is 7.3 inches
  • wheel diameter is 18 inches

Learn more

T185/55R18 tire size in inches
T185/55R18 tire size chart

T185/55R18 tire size in inches

T185/55R18 Height / overall diameter: 26 inches
Height / overall diameter
26 inches
T185/55R18 Tread width: 7.3 inches
Tread width
7.3 inches
T185/55R18 Sidewall: 4 inches
Sidewall
4 inches
T185/55R18 Wheel diameter: 18 inches
Wheel diameter
18 inches
T185/55R18 Circumference: 81.6 inches
Circumference
81.6 inches
T185/55R18 Revolutions: 777 per mile
Revolutions
777 per mile

T185/55R18 — what does it mean?

  • T means "temporary"
  • 185 stands for tread width in millimeters
  • 55 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

T185/55R18 tire code
T185/55R18 tire code

How to convert T185 55R18 to inches?

First of all, we need to divide 185 mm (width) by 25.4 (mm to inch conversion), which will give us a width of 7.3″. Then, 55% of the 7.3″ will result in 4″ 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″ total tire diameter (or height).

For your convenience, below is a table for T185/55R18 conversion to inches:

Inches Metric
Overall diameter (height) 26″ 660 mm
Tread width 7.3″ 185 mm
Wheel diameter 18″ 660 mm
Sidewall height 4″ 102 mm
Circumference 81.6″ 2072 mm
Revolutions 777 / ml 483 / km

Alternatives to a T185/55R18 tire

If you're looking to upsize your T185 55R18 tires, try to stay within 3% deviation of an overall diameter for safety reasons.

Tire Tire diameter Width Wheel Size
245/40R18 25.8″ -0.19% 9.6″ 18″
245/45R18 26.6″ 0.6% 9.6″ 18″
235/45R18 26.4″ 0.41% 9.3″ 18″
275/40R18 26.6″ 0.6% 10.8″ 18″
135/80R18 26.6″ 0.6% 5.3″ 18″
145/65R18 25.4″ -0.57% 5.7″ 18″
T185/55D18 26″ 0% 7.3″ 18″
155/60R18 25.4″ -0.57% 6.1″ 18″
155/70R18 26.6″ 0.6% 6.1″ 18″
205/45R18 25.2″ -0.77% 8.1″ 18″