235/45R20 tire size

A 235/45R20 tire is 28.3 inches (720 mm) tall and 9.3 inches (235 mm) wide, and fits a 20-inch wheel. In inch sizing it is about a 28.3x9.3R20.

Overall diameter28.33in720 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
225/75R15	28.3″	−0.1%	8.9″	6.6″	15″
225/70R16	28.4″	+0.3%	8.9″	6.2″	16″
235/50R19	28.3″	−0.3%	9.3″	4.6″	19″
235/55R18	28.2″	−0.5%	9.3″	5.1″	18″
225/65R17	28.5″	+0.7%	8.9″	5.8″	17″
235/60R17	28.1″	−0.8%	9.3″	5.6″	17″
275/35R21	28.6″	+0.9%	10.8″	3.8″	21″
255/45R19	28.0″	−1.0%	10.0″	4.5″	19″
255/40R20	28.0″	−1.0%	10.0″	4.0″	20″
235/65R16	28.0″	−1.1%	9.3″	6.0″	16″
225/60R18	28.6″	+1.1%	8.9″	5.3″	18″
255/30R22	28.0″	−1.1%	10.0″	3.0″	22″

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.
45: Aspect ratio: the sidewall is 45% as tall as the tire is wide, 106 mm (4.2 in).
R: Radial construction, used by almost every modern tire.
20: Fits a 20-inch wheel.

235/45R20 is about 28.3 inches tall and 9.3 inches wide, on a 20-inch wheel, roughly a 28.3x9.3R20 in inch sizing.

Nearly. It measures 28.3 inches, so it falls between 28 and 29 inches.

225/75R15, 225/70R16, 235/50R19 are the closest common sizes, all within 0.3% of its diameter, so the speedometer stays close to accurate.

265/45R20 is 3.8% taller, so at an indicated 60 mph you would really be doing 62.3 mph. Compare 235/45R20 and 265/45R20.

About 712 per mile (442 per km), from a 89.0-inch circumference.