205/55R15 tire size

A 205/55R15 tire is 23.9 inches (607 mm) tall and 8.1 inches (205 mm) wide, and fits a 15-inch wheel. In inch sizing it is about a 23.9x8.1R15.

Overall diameter23.88in607 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
175/65R15	24.0″	+0.3%	6.9″	4.5″	15″
185/55R16	24.0″	+0.6%	7.3″	4.0″	16″
185/60R15	23.7″	−0.6%	7.3″	4.4″	15″
205/50R16	24.1″	+0.8%	8.1″	4.0″	16″
195/50R16	23.7″	−0.8%	7.7″	3.8″	16″
175/70R14	23.6″	−1.0%	6.9″	4.8″	14″
185/70R14	24.2″	+1.3%	7.3″	5.1″	14″
195/60R15	24.2″	+1.4%	7.7″	4.6″	15″
185/65R14	23.5″	−1.7%	7.3″	4.7″	14″
195/55R15	23.4″	−1.8%	7.7″	4.2″	15″
165/80R13	23.4″	−2.0%	6.5″	5.2″	13″
195/55R16	24.4″	+2.4%	7.7″	4.2″	16″

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

205: Section width: 205 mm (8.1 in) from sidewall to sidewall.
55: Aspect ratio: the sidewall is 55% as tall as the tire is wide, 113 mm (4.4 in).
R: Radial construction, used by almost every modern tire.
15: Fits a 15-inch wheel.

205/55R15 is about 23.9 inches tall and 8.1 inches wide, on a 15-inch wheel, roughly a 23.9x8.1R15 in inch sizing.

Yes. At 23.9 inches it is sold and fitted as a 24-inch tire.

175/65R15, 185/55R16, 185/60R15 are the closest common sizes, all within 0.6% of its diameter, so the speedometer stays close to accurate.

205/60R15 is 3.4% taller, so at an indicated 60 mph you would really be doing 62.0 mph. Compare 205/55R15 and 205/60R15.

About 845 per mile (525 per km), from a 75.0-inch circumference.