235/75R15 tire size

A 235/75R15 tire is 28.9 inches (734 mm) tall and 9.3 inches (235 mm) wide, and fits a 15-inch wheel. In inch sizing it is about a 28.9x9.3R15.

Overall diameter28.88in734 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
285/35R21	28.9″	−0.1%	11.2″	3.9″	21″
235/70R16	29.0″	+0.3%	9.3″	6.5″	16″
225/55R19	28.7″	−0.5%	8.9″	4.9″	19″
275/45R19	28.7″	−0.5%	10.8″	4.9″	19″
235/65R17	29.0″	+0.5%	9.3″	6.0″	17″
255/40R21	29.0″	+0.5%	10.0″	4.0″	21″
255/45R20	29.0″	+0.5%	10.0″	4.5″	20″
255/50R19	29.0″	+0.6%	10.0″	5.0″	19″
255/55R18	29.0″	+0.6%	10.0″	5.5″	18″
255/65R16	29.1″	+0.6%	10.0″	6.5″	16″
255/70R15	29.1″	+0.6%	10.0″	7.0″	15″
215/75R16	28.7″	−0.6%	8.5″	6.3″	16″

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

235: Section width: 235 mm (9.3 in) from sidewall to sidewall.
75: Aspect ratio: the sidewall is 75% as tall as the tire is wide, 176 mm (6.9 in).
R: Radial construction, used by almost every modern tire.
15: Fits a 15-inch wheel.

235/75R15 is about 28.9 inches tall and 9.3 inches wide, on a 15-inch wheel, roughly a 28.9x9.3R15 in inch sizing.

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

285/35R21, 235/70R16, 225/55R19 are the closest common sizes, all within 0.5% of its diameter, so the speedometer stays close to accurate.

30x9.50R15 is 3.9% taller, so at an indicated 60 mph you would really be doing 62.3 mph. Compare 235/75R15 and 30x9.50R15.

About 698 per mile (434 per km), from a 90.7-inch circumference.