245/50R18 tire size

A 245/50R18 tire is 27.6 inches (702 mm) tall and 9.6 inches (245 mm) wide, and fits a 18-inch wheel. In inch sizing it is about a 27.6x9.6R18.

Overall diameter27.65in702 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
275/40R19	27.7″	+0.1%	10.8″	4.3″	19″
225/60R17	27.6″	−0.1%	8.9″	5.3″	17″
245/45R19	27.7″	+0.1%	9.6″	4.3″	19″
215/75R15	27.7″	+0.2%	8.5″	6.3″	15″
245/40R20	27.7″	+0.3%	9.6″	3.9″	20″
225/55R18	27.7″	+0.4%	8.9″	4.9″	18″
245/35R21	27.8″	+0.4%	9.6″	3.4″	21″
215/70R16	27.9″	+0.7%	8.5″	5.9″	16″
225/70R15	27.4″	−0.9%	8.9″	6.2″	15″
235/45R19	27.3″	−1.2%	9.3″	4.2″	19″
215/55R18	27.3″	−1.2%	8.5″	4.7″	18″
265/35R20	27.3″	−1.2%	10.4″	3.7″	20″

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

245: Section width: 245 mm (9.6 in) from sidewall to sidewall.
50: Aspect ratio: the sidewall is 50% as tall as the tire is wide, 123 mm (4.8 in).
R: Radial construction, used by almost every modern tire.
18: Fits a 18-inch wheel.

245/50R18 is about 27.6 inches tall and 9.6 inches wide, on a 18-inch wheel, roughly a 27.6x9.6R18 in inch sizing.

Nearly. It measures 27.6 inches, so it falls between 27 and 28 inches.

275/40R19, 225/60R17, 245/45R19 are the closest common sizes, all within 0.1% of its diameter, so the speedometer stays close to accurate.

225/60R18 is 3.6% taller, so at an indicated 60 mph you would really be doing 62.1 mph. Compare 245/50R18 and 225/60R18.

About 730 per mile (453 per km), from a 86.9-inch circumference.