265/45R20 tire size

A 265/45R20 tire is 29.4 inches (747 mm) tall and 10.4 inches (265 mm) wide, and fits a 20-inch wheel. In inch sizing it is about a 29.4x10.4R20.

Overall diameter29.39in747 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
275/25R24	29.4″	+0.1%	10.8″	2.7″	24″
265/50R19	29.4″	+0.1%	10.4″	5.2″	19″
265/40R21	29.3″	−0.1%	10.4″	4.2″	21″
265/35R22	29.3″	−0.3%	10.4″	3.7″	22″
225/75R16	29.3″	−0.3%	8.9″	6.6″	16″
245/70R16	29.5″	+0.4%	9.6″	6.8″	16″
245/65R17	29.5″	+0.5%	9.6″	6.3″	17″
245/60R18	29.6″	+0.6%	9.6″	5.8″	18″
235/55R19	29.2″	−0.7%	9.3″	5.1″	19″
245/50R20	29.6″	+0.9%	9.6″	4.8″	20″
295/35R21	29.1″	−0.9%	11.6″	4.1″	21″
235/60R18	29.1″	−1.0%	9.3″	5.6″	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.
45: Aspect ratio: the sidewall is 45% as tall as the tire is wide, 119 mm (4.7 in).
R: Radial construction, used by almost every modern tire.
20: Fits a 20-inch wheel.

265/45R20 is about 29.4 inches tall and 10.4 inches wide, on a 20-inch wheel, roughly a 29.4x10.4R20 in inch sizing.

Nearly. It measures 29.4 inches, so it falls between 29 and 30 inches.

275/25R24, 265/50R19, 265/40R21 are the closest common sizes, all within 0.1% of its diameter, so the speedometer stays close to accurate.

265/50R20 is 3.5% taller, so at an indicated 60 mph you would really be doing 62.1 mph. Compare 265/45R20 and 265/50R20.

About 686 per mile (426 per km), from a 92.3-inch circumference.