275/70R18 tire size

A 275/70R18 tire is 33.2 inches (842 mm) tall and 10.8 inches (275 mm) wide, and fits a 18-inch wheel. In inch sizing it is about a 33.2x10.8R18.

Overall diameter33.16in842 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
305/55R20	33.2″	+0.2%	12.0″	6.6″	20″
33x12.50R15	33.0″	−0.5%	12.5″	9.0″	15″
33x12.50R17	33.0″	−0.5%	12.5″	8.0″	17″
33x12.50R18	33.0″	−0.5%	12.5″	7.5″	18″
33x12.50R20	33.0″	−0.5%	12.5″	6.5″	20″
275/60R20	33.0″	−0.5%	10.8″	6.5″	20″
285/75R16	32.8″	−1.0%	11.2″	8.4″	16″
305/70R16	32.8″	−1.0%	12.0″	8.4″	16″
305/45R22	32.8″	−1.1%	12.0″	5.4″	22″
295/55R20	32.8″	−1.2%	11.6″	6.4″	20″
285/70R17	32.7″	−1.4%	11.2″	7.9″	17″
265/70R18	32.6″	−1.7%	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.
70: Aspect ratio: the sidewall is 70% as tall as the tire is wide, 193 mm (7.6 in).
R: Radial construction, used by almost every modern tire.
18: Fits a 18-inch wheel.

275/70R18 is about 33.2 inches tall and 10.8 inches wide, on a 18-inch wheel, roughly a 33.2x10.8R18 in inch sizing.

Yes. At 33.2 inches it is sold and fitted as a 33-inch tire.

305/55R20, 33x12.50R15, 33x12.50R17 are the closest common sizes, all within 0.5% of its diameter, so the speedometer stays close to accurate.

295/70R18 is 3.3% taller, so at an indicated 60 mph you would really be doing 62.0 mph. Compare 275/70R18 and 295/70R18.

About 608 per mile (378 per km), from a 104.2-inch circumference.