275/60R20 tire size

A 275/60R20 tire is 33.0 inches (838 mm) tall and 10.8 inches (275 mm) wide, and fits a 20-inch wheel. In inch sizing it is about a 33.0x10.8R20.

Overall diameter32.99in838 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
33x12.50R15	33.0″	+0.0%	12.5″	9.0″	15″
33x12.50R17	33.0″	+0.0%	12.5″	8.0″	17″
33x12.50R18	33.0″	+0.0%	12.5″	7.5″	18″
33x12.50R20	33.0″	+0.0%	12.5″	6.5″	20″
285/75R16	32.8″	−0.5%	11.2″	8.4″	16″
275/70R18	33.2″	+0.5%	10.8″	7.6″	18″
305/70R16	32.8″	−0.5%	12.0″	8.4″	16″
305/45R22	32.8″	−0.6%	12.0″	5.4″	22″
295/55R20	32.8″	−0.7%	11.6″	6.4″	20″
305/55R20	33.2″	+0.7%	12.0″	6.6″	20″
285/70R17	32.7″	−0.9%	11.2″	7.9″	17″
265/70R18	32.6″	−1.2%	10.4″	7.3″	18″

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

275: Section width: 275 mm (10.8 in) from sidewall to sidewall.
60: Aspect ratio: the sidewall is 60% as tall as the tire is wide, 165 mm (6.5 in).
R: Radial construction, used by almost every modern tire.
20: Fits a 20-inch wheel.

275/60R20 is about 33.0 inches tall and 10.8 inches wide, on a 20-inch wheel, roughly a 33.0x10.8R20 in inch sizing.

Yes. At 33.0 inches it is sold and fitted as a 33-inch tire.

33x12.50R15, 33x12.50R17, 33x12.50R18 are the closest common sizes, all within 0.0% of its diameter, so the speedometer stays close to accurate.

275/65R20 is 3.3% taller, so at an indicated 60 mph you would really be doing 62.0 mph. Compare 275/60R20 and 275/65R20.

About 611 per mile (380 per km), from a 103.6-inch circumference.