285/50R20 tire size

A 285/50R20 tire is 31.2 inches (793 mm) tall and 11.2 inches (285 mm) wide, and fits a 20-inch wheel. In inch sizing it is about a 31.2x11.2R20.

Overall diameter31.22in793 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
275/65R17	31.1″	−0.5%	10.8″	7.0″	17″
255/70R17	31.1″	−0.5%	10.0″	7.0″	17″
255/65R18	31.1″	−0.5%	10.0″	6.5″	18″
255/55R20	31.0″	−0.6%	10.0″	5.5″	20″
31x10.50R15	31.0″	−0.7%	10.5″	8.0″	15″
245/75R17	31.5″	+0.8%	9.6″	7.2″	17″
235/75R17	30.9″	−1.1%	9.3″	6.9″	17″
265/65R18	31.6″	+1.1%	10.4″	6.8″	18″
265/70R17	31.6″	+1.2%	10.4″	7.3″	17″
305/40R22	31.6″	+1.2%	12.0″	4.8″	22″
265/75R16	31.6″	+1.4%	10.4″	7.8″	16″
275/45R21	30.7″	−1.5%	10.8″	4.9″	21″

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.
50: Aspect ratio: the sidewall is 50% as tall as the tire is wide, 143 mm (5.6 in).
R: Radial construction, used by almost every modern tire.
20: Fits a 20-inch wheel.

285/50R20 is about 31.2 inches tall and 11.2 inches wide, on a 20-inch wheel, roughly a 31.2x11.2R20 in inch sizing.

Yes. At 31.2 inches it is sold and fitted as a 31-inch tire.

275/65R17, 255/70R17, 255/65R18 are the closest common sizes, all within 0.5% of its diameter, so the speedometer stays close to accurate.

285/55R20 is 3.6% taller, so at an indicated 60 mph you would really be doing 62.2 mph. Compare 285/50R20 and 285/55R20.

About 646 per mile (401 per km), from a 98.1-inch circumference.