225/60R18 tire size

A 225/60R18 tire is 28.6 inches (727 mm) tall and 8.9 inches (225 mm) wide, and fits a 18-inch wheel. In inch sizing it is about a 28.6x8.9R18.

Overall diameter28.63in727 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
245/50R19	28.6″	+0.1%	9.6″	4.8″	19″
275/40R20	28.7″	+0.1%	10.8″	4.3″	20″
245/45R20	28.7″	+0.2%	9.6″	4.3″	20″
275/35R21	28.6″	−0.2%	10.8″	3.8″	21″
215/75R16	28.7″	+0.2%	8.5″	6.3″	16″
225/55R19	28.7″	+0.4%	8.9″	4.9″	19″
275/45R19	28.7″	+0.4%	10.8″	4.9″	19″
225/65R17	28.5″	−0.4%	8.9″	5.8″	17″
285/35R21	28.9″	+0.8%	11.2″	3.9″	21″
225/70R16	28.4″	−0.8%	8.9″	6.2″	16″
235/75R15	28.9″	+0.9%	9.3″	6.9″	15″
235/45R20	28.3″	−1.1%	9.3″	4.2″	20″

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

225: Section width: 225 mm (8.9 in) from sidewall to sidewall.
60: Aspect ratio: the sidewall is 60% as tall as the tire is wide, 135 mm (5.3 in).
R: Radial construction, used by almost every modern tire.
18: Fits a 18-inch wheel.

225/60R18 is about 28.6 inches tall and 8.9 inches wide, on a 18-inch wheel, roughly a 28.6x8.9R18 in inch sizing.

Nearly. It measures 28.6 inches, so it falls between 28 and 29 inches.

245/50R19, 275/40R20, 245/45R20 are the closest common sizes, all within 0.2% of its diameter, so the speedometer stays close to accurate.

245/60R18 is 3.3% taller, so at an indicated 60 mph you would really be doing 62.0 mph. Compare 225/60R18 and 245/60R18.

About 704 per mile (438 per km), from a 89.9-inch circumference.