185/55R15 tire size

A 185/55R15 tire is 23.0 inches (585 mm) tall and 7.3 inches (185 mm) wide, and fits a 15-inch wheel. In inch sizing it is about a 23.0x7.3R15.

Overall diameter23.01in585 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
175/65R14	23.0″	−0.2%	6.9″	4.5″	14″
165/70R14	23.1″	+0.4%	6.5″	4.5″	14″
185/70R13	23.2″	+0.8%	7.3″	5.1″	13″
195/60R14	23.2″	+0.9%	7.7″	4.6″	14″
155/80R13	22.8″	−1.1%	6.1″	4.9″	13″
185/60R14	22.7″	−1.2%	7.3″	4.4″	14″
195/50R15	22.7″	−1.5%	7.7″	3.8″	15″
175/70R13	22.6″	−1.6%	6.9″	4.8″	13″
165/80R13	23.4″	+1.7%	6.5″	5.2″	13″
195/55R15	23.4″	+1.9%	7.7″	4.2″	15″
185/65R14	23.5″	+2.0%	7.3″	4.7″	14″
165/65R14	22.4″	−2.5%	6.5″	4.2″	14″

Within 3% of the original diameter is the range most tire shops treat as a direct swap. Check load index and clearance too.

185: Section width: 185 mm (7.3 in) from sidewall to sidewall.
55: Aspect ratio: the sidewall is 55% as tall as the tire is wide, 102 mm (4.0 in).
R: Radial construction, used by almost every modern tire.
15: Fits a 15-inch wheel.

185/55R15 is about 23.0 inches tall and 7.3 inches wide, on a 15-inch wheel, roughly a 23.0x7.3R15 in inch sizing.

Yes. At 23.0 inches it is sold and fitted as a 23-inch tire.

175/65R14, 165/70R14, 185/70R13 are the closest common sizes, all within 0.8% of its diameter, so the speedometer stays close to accurate.

185/60R15 is 3.2% taller, so at an indicated 60 mph you would really be doing 61.9 mph. Compare 185/55R15 and 185/60R15.

About 876 per mile (545 per km), from a 72.3-inch circumference.