235/65R18 tire size

A 235/65R18 tire is 30.0 inches (763 mm) tall and 9.3 inches (235 mm) wide, and fits a 18-inch wheel. In inch sizing it is about a 30.0x9.3R18.

Overall diameter30.03in763 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
255/50R20	30.0″	+0.0%	10.0″	5.0″	20″
255/55R19	30.0″	+0.1%	10.0″	5.5″	19″
255/60R18	30.0″	+0.1%	10.0″	6.0″	18″
255/65R17	30.1″	+0.1%	10.0″	6.5″	17″
255/70R16	30.1″	+0.1%	10.0″	7.0″	16″
30x9.50R15	30.0″	−0.1%	9.5″	7.5″	15″
235/70R17	30.0″	−0.2%	9.3″	6.5″	17″
235/55R20	30.2″	+0.5%	9.3″	5.1″	20″
235/75R16	29.9″	−0.5%	9.3″	6.9″	16″
285/35R22	29.9″	−0.6%	11.2″	3.9″	22″
275/45R20	29.7″	−0.9%	10.8″	4.9″	20″
265/40R22	30.3″	+1.1%	10.4″	4.2″	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.
65: Aspect ratio: the sidewall is 65% as tall as the tire is wide, 153 mm (6.0 in).
R: Radial construction, used by almost every modern tire.
18: Fits a 18-inch wheel.

235/65R18 is about 30.0 inches tall and 9.3 inches wide, on a 18-inch wheel, roughly a 30.0x9.3R18 in inch sizing.

Yes. At 30.0 inches it is sold and fitted as a 30-inch tire.

255/50R20, 255/55R19, 255/60R18 are the closest common sizes, all within 0.1% of its diameter, so the speedometer stays close to accurate.

255/65R18 is 3.4% taller, so at an indicated 60 mph you would really be doing 62.0 mph. Compare 235/65R18 and 255/65R18.

About 672 per mile (417 per km), from a 94.3-inch circumference.