285/75R18 tire size

A 285/75R18 tire is 34.8 inches (885 mm) tall and 11.2 inches (285 mm) wide, and fits a 18-inch wheel. In inch sizing it is about a 34.8x11.2R18.

Overall diameter34.83in885 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
35x12.50R15	35.0″	+0.5%	12.5″	10.0″	15″
35x12.50R17	35.0″	+0.5%	12.5″	9.0″	17″
35x12.50R18	35.0″	+0.5%	12.5″	8.5″	18″
35x12.50R20	35.0″	+0.5%	12.5″	7.5″	20″
35x12.50R22	35.0″	+0.5%	12.5″	6.5″	22″
35x12.50R24	35.0″	+0.5%	12.5″	5.5″	24″
315/75R16	34.6″	−0.7%	12.4″	9.3″	16″
315/70R17	34.4″	−1.3%	12.4″	8.7″	17″
295/70R18	34.3″	−1.6%	11.6″	8.1″	18″
275/65R20	34.1″	−2.2%	10.8″	7.0″	20″
295/60R20	33.9″	−2.6%	11.6″	7.0″	20″
285/75R17	33.8″	−2.9%	11.2″	8.4″	17″

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.
75: Aspect ratio: the sidewall is 75% as tall as the tire is wide, 214 mm (8.4 in).
R: Radial construction, used by almost every modern tire.
18: Fits a 18-inch wheel.

285/75R18 is about 34.8 inches tall and 11.2 inches wide, on a 18-inch wheel, roughly a 34.8x11.2R18 in inch sizing.

Yes. At 34.8 inches it is sold and fitted as a 35-inch tire.

35x12.50R15, 35x12.50R17, 35x12.50R18 are the closest common sizes, all within 0.5% of its diameter, so the speedometer stays close to accurate.

35x12.50R18 is 0.5% taller, so at an indicated 60 mph you would really be doing 60.3 mph. Compare 285/75R18 and 35x12.50R18.

About 579 per mile (360 per km), from a 109.4-inch circumference.