265/40R21 tire size

A 265/40R21 tire is 29.3 inches (745 mm) tall and 10.4 inches (265 mm) wide, and fits a 21-inch wheel. In inch sizing it is about a 29.3x10.4R21.

Overall diameter29.35in745 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
265/45R20	29.4″	+0.1%	10.4″	4.7″	20″
265/35R22	29.3″	−0.1%	10.4″	3.7″	22″
225/75R16	29.3″	−0.2%	8.9″	6.6″	16″
275/25R24	29.4″	+0.2%	10.8″	2.7″	24″
265/50R19	29.4″	+0.3%	10.4″	5.2″	19″
245/70R16	29.5″	+0.5%	9.6″	6.8″	16″
235/55R19	29.2″	−0.6%	9.3″	5.1″	19″
245/65R17	29.5″	+0.7%	9.6″	6.3″	17″
295/35R21	29.1″	−0.7%	11.6″	4.1″	21″
245/60R18	29.6″	+0.8%	9.6″	5.8″	18″
235/60R18	29.1″	−0.8%	9.3″	5.6″	18″
285/45R19	29.1″	−0.8%	11.2″	5.0″	19″

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

265: Section width: 265 mm (10.4 in) from sidewall to sidewall.
40: Aspect ratio: the sidewall is 40% as tall as the tire is wide, 106 mm (4.2 in).
R: Radial construction, used by almost every modern tire.
21: Fits a 21-inch wheel.

265/40R21 is about 29.3 inches tall and 10.4 inches wide, on a 21-inch wheel, roughly a 29.3x10.4R21 in inch sizing.

Nearly. It measures 29.3 inches, so it falls between 29 and 30 inches.

265/45R20, 265/35R22, 225/75R16 are the closest common sizes, all within 0.2% of its diameter, so the speedometer stays close to accurate.

275/45R21 is 4.8% taller, so at an indicated 60 mph you would really be doing 62.9 mph. Compare 265/40R21 and 275/45R21.

About 687 per mile (427 per km), from a 92.2-inch circumference.