285/35R21 tire size

A 285/35R21 tire is 28.9 inches (733 mm) tall and 11.2 inches (285 mm) wide, and fits a 21-inch wheel. In inch sizing it is about a 28.9x11.2R21.

Overall diameter28.85in733 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
235/75R15	28.9″	+0.1%	9.3″	6.9″	15″
235/70R16	29.0″	+0.3%	9.3″	6.5″	16″
225/55R19	28.7″	−0.4%	8.9″	4.9″	19″
275/45R19	28.7″	−0.4%	10.8″	4.9″	19″
215/75R16	28.7″	−0.5%	8.5″	6.3″	16″
235/65R17	29.0″	+0.6%	9.3″	6.0″	17″
245/45R20	28.7″	−0.6%	9.6″	4.3″	20″
255/40R21	29.0″	+0.6%	10.0″	4.0″	21″
255/45R20	29.0″	+0.6%	10.0″	4.5″	20″
255/50R19	29.0″	+0.6%	10.0″	5.0″	19″
255/55R18	29.0″	+0.7%	10.0″	5.5″	18″
275/40R20	28.7″	−0.7%	10.8″	4.3″	20″

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.
35: Aspect ratio: the sidewall is 35% as tall as the tire is wide, 100 mm (3.9 in).
R: Radial construction, used by almost every modern tire.
21: Fits a 21-inch wheel.

285/35R21 is about 28.9 inches tall and 11.2 inches wide, on a 21-inch wheel, roughly a 28.9x11.2R21 in inch sizing.

Yes. At 28.9 inches it is sold and fitted as a 29-inch tire.

235/75R15, 235/70R16, 225/55R19 are the closest common sizes, all within 0.4% of its diameter, so the speedometer stays close to accurate.

275/45R21 is 6.5% taller, so at an indicated 60 mph you would really be doing 63.9 mph. Compare 285/35R21 and 275/45R21.

About 699 per mile (434 per km), from a 90.6-inch circumference.