235/55R18 tire size

A 235/55R18 tire is 28.2 inches (716 mm) tall and 9.3 inches (235 mm) wide, and fits a 18-inch wheel. In inch sizing it is about a 28.2x9.3R18.

Overall diameter28.18in716 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
235/50R19	28.3″	+0.3%	9.3″	4.6″	19″
235/60R17	28.1″	−0.3%	9.3″	5.6″	17″
225/75R15	28.3″	+0.4%	8.9″	6.6″	15″
255/45R19	28.0″	−0.5%	10.0″	4.5″	19″
255/40R20	28.0″	−0.5%	10.0″	4.0″	20″
235/45R20	28.3″	+0.5%	9.3″	4.2″	20″
235/65R16	28.0″	−0.5%	9.3″	6.0″	16″
255/30R22	28.0″	−0.5%	10.0″	3.0″	22″
215/65R17	28.0″	−0.6%	8.5″	5.5″	17″
225/70R16	28.4″	+0.8%	8.9″	6.2″	16″
215/70R16	27.9″	−1.2%	8.5″	5.9″	16″
225/65R17	28.5″	+1.2%	8.9″	5.8″	17″

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

235: Section width: 235 mm (9.3 in) from sidewall to sidewall.
55: Aspect ratio: the sidewall is 55% as tall as the tire is wide, 129 mm (5.1 in).
R: Radial construction, used by almost every modern tire.
18: Fits a 18-inch wheel.

235/55R18 is about 28.2 inches tall and 9.3 inches wide, on a 18-inch wheel, roughly a 28.2x9.3R18 in inch sizing.

Yes. At 28.2 inches it is sold and fitted as a 28-inch tire.

235/50R19, 235/60R17, 225/75R15 are the closest common sizes, all within 0.4% of its diameter, so the speedometer stays close to accurate.

255/55R18 is 3.1% taller, so at an indicated 60 mph you would really be doing 61.8 mph. Compare 235/55R18 and 255/55R18.

About 716 per mile (445 per km), from a 88.5-inch circumference.