245/45R20 tire size

A 245/45R20 tire is 28.7 inches (729 mm) tall and 9.6 inches (245 mm) wide, and fits a 20-inch wheel. In inch sizing it is about a 28.7x9.6R20.

Overall diameter28.68in729 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
215/75R16	28.7″	+0.1%	8.5″	6.3″	16″
275/40R20	28.7″	−0.1%	10.8″	4.3″	20″
245/50R19	28.6″	−0.1%	9.6″	4.8″	19″
225/60R18	28.6″	−0.2%	8.9″	5.3″	18″
225/55R19	28.7″	+0.2%	8.9″	4.9″	19″
275/45R19	28.7″	+0.2%	10.8″	4.9″	19″
275/35R21	28.6″	−0.4%	10.8″	3.8″	21″
225/65R17	28.5″	−0.6%	8.9″	5.8″	17″
285/35R21	28.9″	+0.6%	11.2″	3.9″	21″
235/75R15	28.9″	+0.7%	9.3″	6.9″	15″
235/70R16	29.0″	+0.9%	9.3″	6.5″	16″
225/70R16	28.4″	−1.0%	8.9″	6.2″	16″

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

245: Section width: 245 mm (9.6 in) from sidewall to sidewall.
45: Aspect ratio: the sidewall is 45% as tall as the tire is wide, 110 mm (4.3 in).
R: Radial construction, used by almost every modern tire.
20: Fits a 20-inch wheel.

245/45R20 is about 28.7 inches tall and 9.6 inches wide, on a 20-inch wheel, roughly a 28.7x9.6R20 in inch sizing.

Nearly. It measures 28.7 inches, so it falls between 28 and 29 inches.

215/75R16, 275/40R20, 245/50R19 are the closest common sizes, all within 0.1% of its diameter, so the speedometer stays close to accurate.

245/50R20 is 3.4% taller, so at an indicated 60 mph you would really be doing 62.0 mph. Compare 245/45R20 and 245/50R20.

About 703 per mile (437 per km), from a 90.1-inch circumference.