285/55R20 tire size

A 285/55R20 tire is 32.3 inches (822 mm) tall and 11.2 inches (285 mm) wide, and fits a 20-inch wheel. In inch sizing it is about a 32.3x11.2R20.

Overall diameter32.34in822 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
305/35R24	32.4″	+0.2%	12.0″	4.2″	24″
275/70R17	32.2″	−0.6%	10.8″	7.6″	17″
285/65R18	32.6″	+0.8%	11.2″	7.3″	18″
285/45R22	32.1″	−0.8%	11.2″	5.0″	22″
265/70R18	32.6″	+0.8%	10.4″	7.3″	18″
275/65R18	32.1″	−0.8%	10.8″	7.0″	18″
255/75R17	32.1″	−0.9%	10.0″	7.5″	17″
255/70R18	32.1″	−0.9%	10.0″	7.0″	18″
32x11.50R15	32.0″	−1.1%	11.5″	8.5″	15″
285/70R17	32.7″	+1.1%	11.2″	7.9″	17″
275/55R20	31.9″	−1.3%	10.8″	6.0″	20″
295/55R20	32.8″	+1.3%	11.6″	6.4″	20″

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

285: Section width: 285 mm (11.2 in) from sidewall to sidewall.
55: Aspect ratio: the sidewall is 55% as tall as the tire is wide, 157 mm (6.2 in).
R: Radial construction, used by almost every modern tire.
20: Fits a 20-inch wheel.

285/55R20 is about 32.3 inches tall and 11.2 inches wide, on a 20-inch wheel, roughly a 32.3x11.2R20 in inch sizing.

Nearly. It measures 32.3 inches, so it falls between 32 and 33 inches.

305/35R24, 275/70R17, 285/65R18 are the closest common sizes, all within 0.8% of its diameter, so the speedometer stays close to accurate.

295/60R20 is 4.9% taller, so at an indicated 60 mph you would really be doing 63.0 mph. Compare 285/55R20 and 295/60R20.

About 624 per mile (387 per km), from a 101.6-inch circumference.