275/45R20 tire size

A 275/45R20 tire is 29.7 inches (756 mm) tall and 10.8 inches (275 mm) wide, and fits a 20-inch wheel. In inch sizing it is about a 29.7x10.8R20.

Overall diameter29.74in756 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
245/50R20	29.6″	−0.3%	9.6″	4.8″	20″
285/35R22	29.9″	+0.4%	11.2″	3.9″	22″
235/75R16	29.9″	+0.5%	9.3″	6.9″	16″
245/60R18	29.6″	−0.6%	9.6″	5.8″	18″
245/65R17	29.5″	−0.7%	9.6″	6.3″	17″
235/70R17	30.0″	+0.7%	9.3″	6.5″	17″
245/70R16	29.5″	−0.8%	9.6″	6.8″	16″
30x9.50R15	30.0″	+0.9%	9.5″	7.5″	15″
235/65R18	30.0″	+1.0%	9.3″	6.0″	18″
255/50R20	30.0″	+1.0%	10.0″	5.0″	20″
255/55R19	30.0″	+1.0%	10.0″	5.5″	19″
255/60R18	30.0″	+1.0%	10.0″	6.0″	18″

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.
45: Aspect ratio: the sidewall is 45% as tall as the tire is wide, 124 mm (4.9 in).
R: Radial construction, used by almost every modern tire.
20: Fits a 20-inch wheel.

275/45R20 is about 29.7 inches tall and 10.8 inches wide, on a 20-inch wheel, roughly a 29.7x10.8R20 in inch sizing.

Yes. At 29.7 inches it is sold and fitted as a 30-inch tire.

245/50R20, 285/35R22, 235/75R16 are the closest common sizes, all within 0.5% of its diameter, so the speedometer stays close to accurate.

255/55R20 is 4.4% taller, so at an indicated 60 mph you would really be doing 62.6 mph. Compare 275/45R20 and 255/55R20.

About 678 per mile (421 per km), from a 93.4-inch circumference.