225/70R15 tire size

A 225/70R15 tire is 27.4 inches (696 mm) tall and 8.9 inches (225 mm) wide, and fits a 15-inch wheel. In inch sizing it is about a 27.4x8.9R15.

Overall diameter27.40in696 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
235/45R19	27.3″	−0.3%	9.3″	4.2″	19″
215/55R18	27.3″	−0.3%	8.5″	4.7″	18″
265/35R20	27.3″	−0.4%	10.4″	3.7″	20″
235/50R18	27.3″	−0.5%	9.3″	4.6″	18″
235/55R17	27.2″	−0.8%	9.3″	5.1″	17″
225/60R17	27.6″	+0.8%	8.9″	5.3″	17″
215/60R17	27.2″	−0.9%	8.5″	5.1″	17″
245/50R18	27.6″	+0.9%	9.6″	4.8″	18″
275/40R19	27.7″	+0.9%	10.8″	4.3″	19″
245/45R19	27.7″	+1.0%	9.6″	4.3″	19″
215/75R15	27.7″	+1.1%	8.5″	6.3″	15″
235/60R16	27.1″	−1.1%	9.3″	5.6″	16″

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

225: Section width: 225 mm (8.9 in) from sidewall to sidewall.
70: Aspect ratio: the sidewall is 70% as tall as the tire is wide, 158 mm (6.2 in).
R: Radial construction, used by almost every modern tire.
15: Fits a 15-inch wheel.

225/70R15 is about 27.4 inches tall and 8.9 inches wide, on a 15-inch wheel, roughly a 27.4x8.9R15 in inch sizing.

Nearly. It measures 27.4 inches, so it falls between 27 and 28 inches.

235/45R19, 215/55R18, 265/35R20 are the closest common sizes, all within 0.4% of its diameter, so the speedometer stays close to accurate.

225/75R15 is 3.2% taller, so at an indicated 60 mph you would really be doing 61.9 mph. Compare 225/70R15 and 225/75R15.

About 736 per mile (457 per km), from a 86.1-inch circumference.