185/55R16 tire size

A 185/55R16 tire is 24.0 inches (610 mm) tall and 7.3 inches (185 mm) wide, and fits a 16-inch wheel. In inch sizing it is about a 24.0x7.3R16.

Overall diameter24.01in610 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
175/65R15	24.0″	−0.2%	6.9″	4.5″	15″
205/50R16	24.1″	+0.2%	8.1″	4.0″	16″
205/55R15	23.9″	−0.6%	8.1″	4.4″	15″
185/70R14	24.2″	+0.8%	7.3″	5.1″	14″
195/60R15	24.2″	+0.8%	7.7″	4.6″	15″
185/60R15	23.7″	−1.1%	7.3″	4.4″	15″
195/50R16	23.7″	−1.4%	7.7″	3.8″	16″
175/70R14	23.6″	−1.5%	6.9″	4.8″	14″
195/55R16	24.4″	+1.8%	7.7″	4.2″	16″
185/65R15	24.5″	+1.9%	7.3″	4.7″	15″
185/65R14	23.5″	−2.3%	7.3″	4.7″	14″
195/55R15	23.4″	−2.4%	7.7″	4.2″	15″

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.
16: Fits a 16-inch wheel.

185/55R16 is about 24.0 inches tall and 7.3 inches wide, on a 16-inch wheel, roughly a 24.0x7.3R16 in inch sizing.

Yes. At 24.0 inches it is sold and fitted as a 24-inch tire.

175/65R15, 205/50R16, 205/55R15 are the closest common sizes, all within 0.6% of its diameter, so the speedometer stays close to accurate.

225/50R16 is 3.5% taller, so at an indicated 60 mph you would really be doing 62.1 mph. Compare 185/55R16 and 225/50R16.

About 840 per mile (522 per km), from a 75.4-inch circumference.