275/35R21 tire size

A 275/35R21 tire is 28.6 inches (726 mm) tall and 10.8 inches (275 mm) wide, and fits a 21-inch wheel. In inch sizing it is about a 28.6x10.8R21.

Overall diameter28.58in726 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
225/60R18	28.6″	+0.2%	8.9″	5.3″	18″
225/65R17	28.5″	−0.2%	8.9″	5.8″	17″
245/50R19	28.6″	+0.2%	9.6″	4.8″	19″
275/40R20	28.7″	+0.3%	10.8″	4.3″	20″
245/45R20	28.7″	+0.4%	9.6″	4.3″	20″
215/75R16	28.7″	+0.4%	8.5″	6.3″	16″
225/55R19	28.7″	+0.6%	8.9″	4.9″	19″
275/45R19	28.7″	+0.6%	10.8″	4.9″	19″
225/70R16	28.4″	−0.6%	8.9″	6.2″	16″
235/45R20	28.3″	−0.9%	9.3″	4.2″	20″
285/35R21	28.9″	+1.0%	11.2″	3.9″	21″
225/75R15	28.3″	−1.0%	8.9″	6.6″	15″

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

275: Section width: 275 mm (10.8 in) from sidewall to sidewall.
35: Aspect ratio: the sidewall is 35% as tall as the tire is wide, 96 mm (3.8 in).
R: Radial construction, used by almost every modern tire.
21: Fits a 21-inch wheel.

275/35R21 is about 28.6 inches tall and 10.8 inches wide, on a 21-inch wheel, roughly a 28.6x10.8R21 in inch sizing.

Nearly. It measures 28.6 inches, so it falls between 28 and 29 inches.

225/60R18, 225/65R17, 245/50R19 are the closest common sizes, all within 0.2% of its diameter, so the speedometer stays close to accurate.

275/45R21 is 7.6% taller, so at an indicated 60 mph you would really be doing 64.5 mph. Compare 275/35R21 and 275/45R21.

About 706 per mile (439 per km), from a 89.8-inch circumference.