255/40R17 tire size

A 255/40R17 tire is 25.0 inches (636 mm) tall and 10.0 inches (255 mm) wide, and fits a 17-inch wheel. In inch sizing it is about a 25.0x10.0R17.

Overall diameter25.03in636 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
255/35R18	25.0″	−0.0%	10.0″	3.5″	18″
205/50R17	25.1″	+0.2%	8.1″	4.0″	17″
195/65R15	25.0″	−0.2%	7.7″	5.0″	15″
225/40R18	25.1″	+0.2%	8.9″	3.5″	18″
225/45R17	25.0″	−0.2%	8.9″	4.0″	17″
205/55R16	24.9″	−0.6%	8.1″	4.4″	16″
225/35R19	25.2″	+0.7%	8.9″	3.1″	19″
225/50R16	24.9″	−0.7%	8.9″	4.4″	16″
205/70R14	25.3″	+1.1%	8.1″	5.6″	14″
265/35R18	25.3″	+1.1%	10.4″	3.7″	18″
215/55R16	25.3″	+1.1%	8.5″	4.7″	16″
195/70R14	24.7″	−1.1%	7.7″	5.4″	14″

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

255: Section width: 255 mm (10.0 in) from sidewall to sidewall.
40: Aspect ratio: the sidewall is 40% as tall as the tire is wide, 102 mm (4.0 in).
R: Radial construction, used by almost every modern tire.
17: Fits a 17-inch wheel.

255/40R17 is about 25.0 inches tall and 10.0 inches wide, on a 17-inch wheel, roughly a 25.0x10.0R17 in inch sizing.

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

255/35R18, 205/50R17, 195/65R15 are the closest common sizes, all within 0.2% of its diameter, so the speedometer stays close to accurate.

225/50R17 is 3.3% taller, so at an indicated 60 mph you would really be doing 62.0 mph. Compare 255/40R17 and 225/50R17.

About 806 per mile (501 per km), from a 78.6-inch circumference.