225/45R17 tire size

A 225/45R17 tire is 25.0 inches (634 mm) tall and 8.9 inches (225 mm) wide, and fits a 17-inch wheel. In inch sizing it is about a 25.0x8.9R17.

Overall diameter24.97in634 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
195/65R15	25.0″	+0.0%	7.7″	5.0″	15″
255/35R18	25.0″	+0.2%	10.0″	3.5″	18″
255/40R17	25.0″	+0.2%	10.0″	4.0″	17″
205/55R16	24.9″	−0.4%	8.1″	4.4″	16″
205/50R17	25.1″	+0.4%	8.1″	4.0″	17″
225/50R16	24.9″	−0.5%	8.9″	4.4″	16″
225/40R18	25.1″	+0.5%	8.9″	3.5″	18″
195/70R14	24.7″	−0.9%	7.7″	5.4″	14″
225/35R19	25.2″	+0.9%	8.9″	3.1″	19″
245/40R17	24.7″	−1.0%	9.6″	3.9″	17″
205/60R15	24.7″	−1.2%	8.1″	4.8″	15″
205/70R14	25.3″	+1.3%	8.1″	5.6″	14″

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.
45: Aspect ratio: the sidewall is 45% as tall as the tire is wide, 101 mm (4.0 in).
R: Radial construction, used by almost every modern tire.
17: Fits a 17-inch wheel.

225/45R17 is about 25.0 inches tall and 8.9 inches wide, on a 17-inch wheel, roughly a 25.0x8.9R17 in inch sizing.

Yes. At 25.0 inches it is sold and fitted as a 25-inch tire.

195/65R15, 255/35R18, 255/40R17 are the closest common sizes, all within 0.2% of its diameter, so the speedometer stays close to accurate.

225/50R17 is 3.5% taller, so at an indicated 60 mph you would really be doing 62.1 mph. Compare 225/45R17 and 225/50R17.

About 808 per mile (502 per km), from a 78.5-inch circumference.