245/75R17 tire size

A 245/75R17 tire is 31.5 inches (799 mm) tall and 9.6 inches (245 mm) wide, and fits a 17-inch wheel. In inch sizing it is about a 31.5x9.6R17.

Overall diameter31.47in799 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
265/65R18	31.6″	+0.3%	10.4″	6.8″	18″
265/70R17	31.6″	+0.4%	10.4″	7.3″	17″
305/40R22	31.6″	+0.4%	12.0″	4.8″	22″
265/75R16	31.6″	+0.6%	10.4″	7.8″	16″
285/50R20	31.2″	−0.8%	11.2″	5.6″	20″
275/65R17	31.1″	−1.3%	10.8″	7.0″	17″
255/70R17	31.1″	−1.3%	10.0″	7.0″	17″
255/65R18	31.1″	−1.3%	10.0″	6.5″	18″
255/55R20	31.0″	−1.4%	10.0″	5.5″	20″
275/55R20	31.9″	+1.4%	10.8″	6.0″	20″
31x10.50R15	31.0″	−1.5%	10.5″	8.0″	15″
32x11.50R15	32.0″	+1.7%	11.5″	8.5″	15″

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.
75: Aspect ratio: the sidewall is 75% as tall as the tire is wide, 184 mm (7.2 in).
R: Radial construction, used by almost every modern tire.
17: Fits a 17-inch wheel.

245/75R17 is about 31.5 inches tall and 9.6 inches wide, on a 17-inch wheel, roughly a 31.5x9.6R17 in inch sizing.

Nearly. It measures 31.5 inches, so it falls between 31 and 32 inches.

265/65R18, 265/70R17, 305/40R22 are the closest common sizes, all within 0.4% of its diameter, so the speedometer stays close to accurate.

285/70R17 is 3.9% taller, so at an indicated 60 mph you would really be doing 62.4 mph. Compare 245/75R17 and 285/70R17.

About 641 per mile (398 per km), from a 98.9-inch circumference.