275/65R18 tire size

A 275/65R18 tire is 32.1 inches (815 mm) tall and 10.8 inches (275 mm) wide, and fits a 18-inch wheel. In inch sizing it is about a 32.1x10.8R18.

Overall diameter32.07in815 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
255/75R17	32.1″	−0.0%	10.0″	7.5″	17″
255/70R18	32.1″	−0.1%	10.0″	7.0″	18″
285/45R22	32.1″	+0.1%	11.2″	5.0″	22″
32x11.50R15	32.0″	−0.2%	11.5″	8.5″	15″
275/70R17	32.2″	+0.3%	10.8″	7.6″	17″
275/55R20	31.9″	−0.5%	10.8″	6.0″	20″
285/55R20	32.3″	+0.8%	11.2″	6.2″	20″
305/35R24	32.4″	+1.0%	12.0″	4.2″	24″
265/75R16	31.6″	−1.3%	10.4″	7.8″	16″
265/70R17	31.6″	−1.5%	10.4″	7.3″	17″
305/40R22	31.6″	−1.5%	12.0″	4.8″	22″
265/65R18	31.6″	−1.6%	10.4″	6.8″	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.
65: Aspect ratio: the sidewall is 65% as tall as the tire is wide, 179 mm (7.0 in).
R: Radial construction, used by almost every modern tire.
18: Fits a 18-inch wheel.

275/65R18 is about 32.1 inches tall and 10.8 inches wide, on a 18-inch wheel, roughly a 32.1x10.8R18 in inch sizing.

Yes. At 32.1 inches it is sold and fitted as a 32-inch tire.

255/75R17, 255/70R18, 285/45R22 are the closest common sizes, all within 0.1% of its diameter, so the speedometer stays close to accurate.

275/70R18 is 3.4% taller, so at an indicated 60 mph you would really be doing 62.0 mph. Compare 275/65R18 and 275/70R18.

About 629 per mile (391 per km), from a 100.8-inch circumference.