How tall is a 185/55R15 tire?

A 185/55R15 has a nominal overall diameter of 23.02 inches (585 mm), calculated as the 15-inch wheel plus two sidewalls. This is the unloaded figure — a fitted tire sits fractionally shorter under the weight of the vehicle.

What wheel size does a 185/55R15 tire fit?

A 185/55R15 fits a wheel of 15 inches in diameter. The wheel also has to be within the rim width range the manufacturer publishes for this size, which is printed in the tire's spec sheet.

What do the numbers in 185/55R15 mean?

185 is the section width in millimetres. 55 is the aspect ratio — the sidewall is 55% of the width, so 101.8 mm here. R marks the construction (radial). 15 is the wheel diameter in inches.

Size Dimensions & Specs

Tires Size 185/55R15

Dimensions, specs, and every size 185/55R15 tire currently in stock

Overall Height

23.02"

585 mm · calculated

Section Width

185 mm

7.28 inches

Sidewall Height

4.01"

101.8 mm · 55% profile

Wheel Diameter

15"

381.0 mm

185/55R15 Specifications

Read directly from the size code. Load index, speed rating, and rim width range vary by model.

Specification	Imperial	Metric
Section width	7.28 in	185 mm
Aspect ratio	55%	—
Sidewall height	4.01 in	101.8 mm
Overall diameter (calculated)	23.02 in	585 mm
Wheel / rim diameter	15 in	381.0 mm
Construction	Radial	—

What does 185/55R15 mean?

Reading the code on your sidewall

Section width

185 mm

The distance from sidewall to sidewall across the tire's widest point.

Aspect ratio

55% profile

The sidewall stands 55% of the section width, which is 101.8 mm on this size.

Construction (R)

Radial

The body plies run across the tire at right angles to the direction of travel.

Wheel diameter

15 in

Fits a wheel measuring 15 inches across.

185/55R15 Questions & Answers

Dimensions and fitment guidelines for size 185/55R15

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