265/50R20 tire size

A 265/50R20 tire is 30.4 inches (773 mm) tall and 10.4 inches (265 mm) wide, and fits a 20-inch wheel. In inch sizing it is about a 30.4x10.4R20.

Overall diameter30.43in773 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
245/75R16	30.5″	+0.1%	9.6″	7.2″	16″
245/70R17	30.5″	+0.2%	9.6″	6.8″	17″
265/60R18	30.5″	+0.3%	10.4″	6.3″	18″
265/40R22	30.3″	−0.3%	10.4″	4.2″	22″
265/65R17	30.6″	+0.4%	10.4″	6.8″	17″
265/70R16	30.6″	+0.6%	10.4″	7.3″	16″
275/40R22	30.7″	+0.8%	10.8″	4.3″	22″
235/55R20	30.2″	−0.8%	9.3″	5.1″	20″
275/45R21	30.7″	+1.0%	10.8″	4.9″	21″
255/70R16	30.1″	−1.2%	10.0″	7.0″	16″
255/65R17	30.1″	−1.3%	10.0″	6.5″	17″
255/60R18	30.0″	−1.3%	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.

265: Section width: 265 mm (10.4 in) from sidewall to sidewall.
50: Aspect ratio: the sidewall is 50% as tall as the tire is wide, 133 mm (5.2 in).
R: Radial construction, used by almost every modern tire.
20: Fits a 20-inch wheel.

265/50R20 is about 30.4 inches tall and 10.4 inches wide, on a 20-inch wheel, roughly a 30.4x10.4R20 in inch sizing.

Nearly. It measures 30.4 inches, so it falls between 30 and 31 inches.

245/75R16, 245/70R17, 265/60R18 are the closest common sizes, all within 0.3% of its diameter, so the speedometer stays close to accurate.

275/55R20 is 4.9% taller, so at an indicated 60 mph you would really be doing 62.9 mph. Compare 265/50R20 and 275/55R20.

About 663 per mile (412 per km), from a 95.6-inch circumference.