245/40R20 tire size

A 245/40R20 tire is 27.7 inches (704 mm) tall and 9.6 inches (245 mm) wide, and fits a 20-inch wheel. In inch sizing it is about a 27.7x9.6R20.

Overall diameter27.72in704 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
215/75R15	27.7″	−0.1%	8.5″	6.3″	15″
225/55R18	27.7″	+0.1%	8.9″	4.9″	18″
245/35R21	27.8″	+0.1%	9.6″	3.4″	21″
245/45R19	27.7″	−0.1%	9.6″	4.3″	19″
275/40R19	27.7″	−0.2%	10.8″	4.3″	19″
245/50R18	27.6″	−0.3%	9.6″	4.8″	18″
225/60R17	27.6″	−0.3%	8.9″	5.3″	17″
215/70R16	27.9″	+0.5%	8.5″	5.9″	16″
215/65R17	28.0″	+1.0%	8.5″	5.5″	17″
255/30R22	28.0″	+1.1%	10.0″	3.0″	22″
235/65R16	28.0″	+1.1%	9.3″	6.0″	16″
225/70R15	27.4″	−1.1%	8.9″	6.2″	15″

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.
40: Aspect ratio: the sidewall is 40% as tall as the tire is wide, 98 mm (3.9 in).
R: Radial construction, used by almost every modern tire.
20: Fits a 20-inch wheel.

245/40R20 is about 27.7 inches tall and 9.6 inches wide, on a 20-inch wheel, roughly a 27.7x9.6R20 in inch sizing.

Yes. At 27.7 inches it is sold and fitted as a 28-inch tire.

215/75R15, 225/55R18, 245/35R21 are the closest common sizes, all within 0.1% of its diameter, so the speedometer stays close to accurate.

275/40R20 is 3.4% taller, so at an indicated 60 mph you would really be doing 62.0 mph. Compare 245/40R20 and 275/40R20.

About 728 per mile (452 per km), from a 87.1-inch circumference.