245/40R17 tire size

A 245/40R17 tire is 24.7 inches (628 mm) tall and 9.6 inches (245 mm) wide, and fits a 17-inch wheel. In inch sizing it is about a 24.7x9.6R17.

Overall diameter24.72in628 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
195/70R14	24.7″	+0.1%	7.7″	5.4″	14″
205/60R15	24.7″	−0.1%	8.1″	4.8″	15″
215/45R17	24.6″	−0.4%	8.5″	3.8″	17″
225/50R16	24.9″	+0.6%	8.9″	4.4″	16″
205/55R16	24.9″	+0.7%	8.1″	4.4″	16″
185/65R15	24.5″	−1.0%	7.3″	4.7″	15″
225/45R17	25.0″	+1.0%	8.9″	4.0″	17″
195/65R15	25.0″	+1.1%	7.7″	5.0″	15″
195/55R16	24.4″	−1.1%	7.7″	4.2″	16″
255/35R18	25.0″	+1.3%	10.0″	3.5″	18″
255/40R17	25.0″	+1.3%	10.0″	4.0″	17″
205/50R17	25.1″	+1.4%	8.1″	4.0″	17″

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

245: Section width: 245 mm (9.6 in) from sidewall to sidewall.
40: Aspect ratio: the sidewall is 40% as tall as the tire is wide, 98 mm (3.9 in).
R: Radial construction, used by almost every modern tire.
17: Fits a 17-inch wheel.

245/40R17 is about 24.7 inches tall and 9.6 inches wide, on a 17-inch wheel, roughly a 24.7x9.6R17 in inch sizing.

Yes. At 24.7 inches it is sold and fitted as a 25-inch tire.

195/70R14, 205/60R15, 215/45R17 are the closest common sizes, all within 0.4% of its diameter, so the speedometer stays close to accurate.

215/50R17 is 3.0% taller, so at an indicated 60 mph you would really be doing 61.8 mph. Compare 245/40R17 and 215/50R17.

About 816 per mile (507 per km), from a 77.6-inch circumference.