185/55R15 in inches

How tall is a 185 55R15 tire?

When converted to inches, the equivalent of a 185/55R15 tire size is 23x7.3R15. It means that:

  • height overall (or diameter) is 23 inches
  • tread width is 7.3 inches
  • wheel diameter is 15 inches

Learn more

185/55R15 tire size in inches
185/55R15 tire size chart

185/55R15 tire size in inches

185/55R15 Height / overall diameter: 23 inches
Height / overall diameter
23 inches
185/55R15 Tread width: 7.3 inches
Tread width
7.3 inches
185/55R15 Sidewall: 4 inches
Sidewall
4 inches
185/55R15 Wheel diameter: 15 inches
Wheel diameter
15 inches
185/55R15 Circumference: 72.2 inches
Circumference
72.2 inches
185/55R15 Revolutions: 877 per mile
Revolutions
877 per mile

185/55R15 — what does it mean?

  • 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
  • 15 is a wheel diameter (or rim) in inches

185/55R15 tire code
185/55R15 tire code

How to convert 185 55R15 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 15″ rim diameter with two of the sidewall heights. It will result in a 23″ total tire diameter (or height).

For your convenience, below is a table for 185/55R15 conversion to inches:

Inches Metric
Overall diameter (height) 23″ 584 mm
Tread width 7.3″ 185 mm
Wheel diameter 15″ 584 mm
Sidewall height 4″ 102 mm
Circumference 72.2″ 1834 mm
Revolutions 877 / ml 545 / km

Alternatives to a 185/55R15 tire

If you're looking to upsize your 185 55R15 tires, try to stay within 3% deviation of an overall diameter for safety reasons.

Tire Tire diameter Width Wheel Size
125/80R15 22.8″ -0.21% 4.9″ 15″
135/70R15 22.4″ -0.65% 5.3″ 15″
135/80R15 23.6″ 0.63% 5.3″ 15″
145/65R15 22.4″ -0.65% 5.7″ 15″
155/60R15 22.4″ -0.65% 6.1″ 15″
155/65R15 23″ 0% 6.1″ 15″
155/70R15 23.6″ 0.63% 6.1″ 15″
165/60R15 22.8″ -0.21% 6.5″ 15″
165/65R15 23.4″ 0.42% 6.5″ 15″
175/55R15 22.6″ -0.43% 6.9″ 15″