205/55R17 tire size

A 205/55R17 tire is 25.9 inches (657 mm) tall and 8.1 inches (205 mm) wide, and fits a 17-inch wheel. In inch sizing it is about a 25.9x8.1R17.

Overall diameter25.88in657 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
225/50R17	25.9″	−0.1%	8.9″	4.4″	17″
225/45R18	26.0″	+0.4%	8.9″	4.0″	18″
215/65R15	26.0″	+0.5%	8.5″	5.5″	15″
245/35R19	25.8″	−0.5%	9.6″	3.4″	19″
225/55R16	25.7″	−0.5%	8.9″	4.9″	16″
255/35R19	26.0″	+0.6%	10.0″	3.5″	19″
255/40R18	26.0″	+0.6%	10.0″	4.0″	18″
245/40R18	25.7″	−0.6%	9.6″	3.9″	18″
205/60R16	25.7″	−0.7%	8.1″	4.8″	16″
245/45R17	25.7″	−0.8%	9.6″	4.3″	17″
225/40R19	26.1″	+0.8%	8.9″	3.5″	19″
205/75R14	26.1″	+0.9%	8.1″	6.1″	14″

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

205: Section width: 205 mm (8.1 in) from sidewall to sidewall.
55: Aspect ratio: the sidewall is 55% as tall as the tire is wide, 113 mm (4.4 in).
R: Radial construction, used by almost every modern tire.
17: Fits a 17-inch wheel.

205/55R17 is about 25.9 inches tall and 8.1 inches wide, on a 17-inch wheel, roughly a 25.9x8.1R17 in inch sizing.

Yes. At 25.9 inches it is sold and fitted as a 26-inch tire.

225/50R17, 225/45R18, 215/65R15 are the closest common sizes, all within 0.5% of its diameter, so the speedometer stays close to accurate.

225/55R17 is 3.3% taller, so at an indicated 60 mph you would really be doing 62.0 mph. Compare 205/55R17 and 225/55R17.

About 779 per mile (484 per km), from a 81.3-inch circumference.