235/55R20 tire size

A 235/55R20 tire is 30.2 inches (767 mm) tall and 9.3 inches (235 mm) wide, and fits a 20-inch wheel. In inch sizing it is about a 30.2x9.3R20.

Overall diameter30.18in767 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
255/70R16	30.1″	−0.4%	10.0″	7.0″	16″
255/65R17	30.1″	−0.4%	10.0″	6.5″	17″
255/60R18	30.0″	−0.4%	10.0″	6.0″	18″
255/55R19	30.0″	−0.4%	10.0″	5.5″	19″
255/50R20	30.0″	−0.5%	10.0″	5.0″	20″
235/65R18	30.0″	−0.5%	9.3″	6.0″	18″
265/40R22	30.3″	+0.6%	10.4″	4.2″	22″
30x9.50R15	30.0″	−0.6%	9.5″	7.5″	15″
235/70R17	30.0″	−0.7%	9.3″	6.5″	17″
265/50R20	30.4″	+0.8%	10.4″	5.2″	20″
245/75R16	30.5″	+1.0%	9.6″	7.2″	16″
235/75R16	29.9″	−1.0%	9.3″	6.9″	16″

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

235: Section width: 235 mm (9.3 in) from sidewall to sidewall.
55: Aspect ratio: the sidewall is 55% as tall as the tire is wide, 129 mm (5.1 in).
R: Radial construction, used by almost every modern tire.
20: Fits a 20-inch wheel.

235/55R20 is about 30.2 inches tall and 9.3 inches wide, on a 20-inch wheel, roughly a 30.2x9.3R20 in inch sizing.

Yes. At 30.2 inches it is sold and fitted as a 30-inch tire.

255/70R16, 255/65R17, 255/60R18 are the closest common sizes, all within 0.4% of its diameter, so the speedometer stays close to accurate.

285/50R20 is 3.5% taller, so at an indicated 60 mph you would really be doing 62.1 mph. Compare 235/55R20 and 285/50R20.

About 668 per mile (415 per km), from a 94.8-inch circumference.