245/35R21 tire size

A 245/35R21 tire is 27.8 inches (705 mm) tall and 9.6 inches (245 mm) wide, and fits a 21-inch wheel. In inch sizing it is about a 27.8x9.6R21.

Overall diameter27.75in705 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
225/55R18	27.7″	−0.0%	8.9″	4.9″	18″
245/40R20	27.7″	−0.1%	9.6″	3.9″	20″
215/75R15	27.7″	−0.2%	8.5″	6.3″	15″
245/45R19	27.7″	−0.3%	9.6″	4.3″	19″
275/40R19	27.7″	−0.3%	10.8″	4.3″	19″
215/70R16	27.9″	+0.4%	8.5″	5.9″	16″
245/50R18	27.6″	−0.4%	9.6″	4.8″	18″
225/60R17	27.6″	−0.4%	8.9″	5.3″	17″
215/65R17	28.0″	+0.9%	8.5″	5.5″	17″
255/30R22	28.0″	+1.0%	10.0″	3.0″	22″
235/65R16	28.0″	+1.0%	9.3″	6.0″	16″
255/40R20	28.0″	+1.0%	10.0″	4.0″	20″

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

245: Section width: 245 mm (9.6 in) from sidewall to sidewall.
35: Aspect ratio: the sidewall is 35% as tall as the tire is wide, 86 mm (3.4 in).
R: Radial construction, used by almost every modern tire.
21: Fits a 21-inch wheel.

245/35R21 is about 27.8 inches tall and 9.6 inches wide, on a 21-inch wheel, roughly a 27.8x9.6R21 in inch sizing.

Yes. At 27.8 inches it is sold and fitted as a 28-inch tire.

225/55R18, 245/40R20, 215/75R15 are the closest common sizes, all within 0.2% of its diameter, so the speedometer stays close to accurate.

285/35R21 is 4.0% taller, so at an indicated 60 mph you would really be doing 62.4 mph. Compare 245/35R21 and 285/35R21.

About 727 per mile (452 per km), from a 87.2-inch circumference.