275/55R20 tire size

A 275/55R20 tire is 31.9 inches (811 mm) tall and 10.8 inches (275 mm) wide, and fits a 20-inch wheel. In inch sizing it is about a 31.9x10.8R20.

Overall diameter31.91in811 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
32x11.50R15	32.0″	+0.3%	11.5″	8.5″	15″
255/70R18	32.1″	+0.5%	10.0″	7.0″	18″
255/75R17	32.1″	+0.5%	10.0″	7.5″	17″
275/65R18	32.1″	+0.5%	10.8″	7.0″	18″
285/45R22	32.1″	+0.6%	11.2″	5.0″	22″
275/70R17	32.2″	+0.8%	10.8″	7.6″	17″
265/75R16	31.6″	−0.8%	10.4″	7.8″	16″
265/70R17	31.6″	−1.0%	10.4″	7.3″	17″
305/40R22	31.6″	−1.0%	12.0″	4.8″	22″
265/65R18	31.6″	−1.1%	10.4″	6.8″	18″
285/55R20	32.3″	+1.4%	11.2″	6.2″	20″
245/75R17	31.5″	−1.4%	9.6″	7.2″	17″

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.
55: Aspect ratio: the sidewall is 55% as tall as the tire is wide, 151 mm (6.0 in).
R: Radial construction, used by almost every modern tire.
20: Fits a 20-inch wheel.

275/55R20 is about 31.9 inches tall and 10.8 inches wide, on a 20-inch wheel, roughly a 31.9x10.8R20 in inch sizing.

Yes. At 31.9 inches it is sold and fitted as a 32-inch tire.

32x11.50R15, 255/70R18, 255/75R17 are the closest common sizes, all within 0.5% of its diameter, so the speedometer stays close to accurate.

275/60R20 is 3.4% taller, so at an indicated 60 mph you would really be doing 62.0 mph. Compare 275/55R20 and 275/60R20.

About 632 per mile (393 per km), from a 100.2-inch circumference.