235/55R17 tire size

A 235/55R17 tire is 27.2 inches (690 mm) tall and 9.3 inches (235 mm) wide, and fits a 17-inch wheel. In inch sizing it is about a 27.2x9.3R17.

Overall diameter27.18in690 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
215/60R17	27.2″	−0.1%	8.5″	5.1″	17″
235/60R16	27.1″	−0.3%	9.3″	5.6″	16″
235/50R18	27.3″	+0.3%	9.3″	4.6″	18″
265/35R20	27.3″	+0.5%	10.4″	3.7″	20″
215/55R18	27.3″	+0.5%	8.5″	4.7″	18″
255/45R18	27.0″	−0.5%	10.0″	4.5″	18″
255/40R19	27.0″	−0.5%	10.0″	4.0″	19″
235/45R19	27.3″	+0.6%	9.3″	4.2″	19″
255/35R20	27.0″	−0.6%	10.0″	3.5″	20″
215/65R16	27.0″	−0.6%	8.5″	5.5″	16″
225/45R19	27.0″	−0.8%	8.9″	4.0″	19″
225/70R15	27.4″	+0.8%	8.9″	6.2″	15″

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.
55: Aspect ratio: the sidewall is 55% as tall as the tire is wide, 129 mm (5.1 in).
R: Radial construction, used by almost every modern tire.
17: Fits a 17-inch wheel.

235/55R17 is about 27.2 inches tall and 9.3 inches wide, on a 17-inch wheel, roughly a 27.2x9.3R17 in inch sizing.

Yes. At 27.2 inches it is sold and fitted as a 27-inch tire.

215/60R17, 235/60R16, 235/50R18 are the closest common sizes, all within 0.3% of its diameter, so the speedometer stays close to accurate.

215/65R17 is 3.0% taller, so at an indicated 60 mph you would really be doing 61.8 mph. Compare 235/55R17 and 215/65R17.

About 742 per mile (461 per km), from a 85.4-inch circumference.