275/40R20 tire size

A 275/40R20 tire is 28.7 inches (728 mm) tall and 10.8 inches (275 mm) wide, and fits a 20-inch wheel. In inch sizing it is about a 28.7x10.8R20.

Overall diameter28.66in728 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″
245/45R20	28.7″	+0.1%	9.6″	4.3″	20″
225/60R18	28.6″	−0.1%	8.9″	5.3″	18″
215/75R16	28.7″	+0.1%	8.5″	6.3″	16″
225/55R19	28.7″	+0.3%	8.9″	4.9″	19″
275/45R19	28.7″	+0.3%	10.8″	4.9″	19″
275/35R21	28.6″	−0.3%	10.8″	3.8″	21″
225/65R17	28.5″	−0.5%	8.9″	5.8″	17″
285/35R21	28.9″	+0.7%	11.2″	3.9″	21″
235/75R15	28.9″	+0.8%	9.3″	6.9″	15″
225/70R16	28.4″	−0.9%	8.9″	6.2″	16″
235/70R16	29.0″	+1.0%	9.3″	6.5″	16″

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

275: Section width: 275 mm (10.8 in) from sidewall to sidewall.
40: Aspect ratio: the sidewall is 40% 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.

275/40R20 is about 28.7 inches tall and 10.8 inches wide, on a 20-inch wheel, roughly a 28.7x10.8R20 in inch sizing.

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

245/50R19, 245/45R20, 225/60R18 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 62.1 mph. Compare 275/40R20 and 245/50R20.

About 704 per mile (437 per km), from a 90.0-inch circumference.