305/35R24 tire size

A 305/35R24 tire is 32.4 inches (823 mm) tall and 12.0 inches (305 mm) wide, and fits a 24-inch wheel. In inch sizing it is about a 32.4x12.0R24.

Overall diameter32.41in823 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
285/55R20	32.3″	−0.2%	11.2″	6.2″	20″
285/65R18	32.6″	+0.6%	11.2″	7.3″	18″
265/70R18	32.6″	+0.6%	10.4″	7.3″	18″
275/70R17	32.2″	−0.8%	10.8″	7.6″	17″
285/70R17	32.7″	+0.9%	11.2″	7.9″	17″
285/45R22	32.1″	−0.9%	11.2″	5.0″	22″
275/65R18	32.1″	−1.0%	10.8″	7.0″	18″
255/75R17	32.1″	−1.1%	10.0″	7.5″	17″
255/70R18	32.1″	−1.1%	10.0″	7.0″	18″
295/55R20	32.8″	+1.1%	11.6″	6.4″	20″
305/45R22	32.8″	+1.2%	12.0″	5.4″	22″
32x11.50R15	32.0″	−1.3%	11.5″	8.5″	15″

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

305: Section width: 305 mm (12.0 in) from sidewall to sidewall.
35: Aspect ratio: the sidewall is 35% as tall as the tire is wide, 107 mm (4.2 in).
R: Radial construction, used by almost every modern tire.
24: Fits a 24-inch wheel.

305/35R24 is about 32.4 inches tall and 12.0 inches wide, on a 24-inch wheel, roughly a 32.4x12.0R24 in inch sizing.

Nearly. It measures 32.4 inches, so it falls between 32 and 33 inches.

285/55R20, 285/65R18, 265/70R18 are the closest common sizes, all within 0.6% of its diameter, so the speedometer stays close to accurate.

35x12.50R24 is 8.0% taller, so at an indicated 60 mph you would really be doing 64.8 mph. Compare 305/35R24 and 35x12.50R24.

About 622 per mile (387 per km), from a 101.8-inch circumference.