215/45R18 tire size

A 215/45R18 tire is 25.6 inches (651 mm) tall and 8.5 inches (215 mm) wide, and fits a 18-inch wheel. In inch sizing it is about a 25.6x8.5R18.

Overall diameter25.62in651 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
225/60R15	25.6″	+0.0%	8.9″	5.3″	15″
275/35R18	25.6″	−0.2%	10.8″	3.8″	18″
245/45R17	25.7″	+0.2%	9.6″	4.3″	17″
205/60R16	25.7″	+0.3%	8.1″	4.8″	16″
245/40R18	25.7″	+0.4%	9.6″	3.9″	18″
195/75R14	25.5″	−0.4%	7.7″	5.8″	14″
225/55R16	25.7″	+0.5%	8.9″	4.9″	16″
205/65R15	25.5″	−0.5%	8.1″	5.2″	15″
245/35R19	25.8″	+0.5%	9.6″	3.4″	19″
235/35R19	25.5″	−0.6%	9.3″	3.2″	19″
215/50R17	25.5″	−0.6%	8.5″	4.2″	17″
235/40R18	25.4″	−0.8%	9.3″	3.7″	18″

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

215: Section width: 215 mm (8.5 in) from sidewall to sidewall.
45: Aspect ratio: the sidewall is 45% as tall as the tire is wide, 97 mm (3.8 in).
R: Radial construction, used by almost every modern tire.
18: Fits a 18-inch wheel.

215/45R18 is about 25.6 inches tall and 8.5 inches wide, on a 18-inch wheel, roughly a 25.6x8.5R18 in inch sizing.

Nearly. It measures 25.6 inches, so it falls between 25 and 26 inches.

225/60R15, 275/35R18, 245/45R17 are the closest common sizes, all within 0.2% of its diameter, so the speedometer stays close to accurate.

235/45R18 is 2.8% taller, so at an indicated 60 mph you would really be doing 61.7 mph. Compare 215/45R18 and 235/45R18.

About 787 per mile (489 per km), from a 80.5-inch circumference.