285/65R18 tire size

A 285/65R18 tire is 32.6 inches (828 mm) tall and 11.2 inches (285 mm) wide, and fits a 18-inch wheel. In inch sizing it is about a 32.6x11.2R18.

Overall diameter32.59in828 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
265/70R18	32.6″	+0.1%	10.4″	7.3″	18″
285/70R17	32.7″	+0.4%	11.2″	7.9″	17″
305/35R24	32.4″	−0.6%	12.0″	4.2″	24″
295/55R20	32.8″	+0.6%	11.6″	6.4″	20″
305/45R22	32.8″	+0.7%	12.0″	5.4″	22″
305/70R16	32.8″	+0.7%	12.0″	8.4″	16″
285/75R16	32.8″	+0.7%	11.2″	8.4″	16″
285/55R20	32.3″	−0.7%	11.2″	6.2″	20″
275/60R20	33.0″	+1.2%	10.8″	6.5″	20″
33x12.50R15	33.0″	+1.3%	12.5″	9.0″	15″
33x12.50R17	33.0″	+1.3%	12.5″	8.0″	17″
33x12.50R18	33.0″	+1.3%	12.5″	7.5″	18″

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

285: Section width: 285 mm (11.2 in) from sidewall to sidewall.
65: Aspect ratio: the sidewall is 65% as tall as the tire is wide, 185 mm (7.3 in).
R: Radial construction, used by almost every modern tire.
18: Fits a 18-inch wheel.

285/65R18 is about 32.6 inches tall and 11.2 inches wide, on a 18-inch wheel, roughly a 32.6x11.2R18 in inch sizing.

Nearly. It measures 32.6 inches, so it falls between 32 and 33 inches.

265/70R18, 285/70R17, 305/35R24 are the closest common sizes, all within 0.6% of its diameter, so the speedometer stays close to accurate.

295/70R18 is 5.1% taller, so at an indicated 60 mph you would really be doing 63.1 mph. Compare 285/65R18 and 295/70R18.

About 619 per mile (385 per km), from a 102.4-inch circumference.