255/75R17 tire size

A 255/75R17 tire is 32.1 inches (814 mm) tall and 10.0 inches (255 mm) wide, and fits a 17-inch wheel. In inch sizing it is about a 32.1x10.0R17.

Overall diameter32.06in814 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
255/70R18	32.1″	−0.0%	10.0″	7.0″	18″
275/65R18	32.1″	+0.0%	10.8″	7.0″	18″
285/45R22	32.1″	+0.1%	11.2″	5.0″	22″
32x11.50R15	32.0″	−0.2%	11.5″	8.5″	15″
275/70R17	32.2″	+0.3%	10.8″	7.6″	17″
275/55R20	31.9″	−0.5%	10.8″	6.0″	20″
285/55R20	32.3″	+0.9%	11.2″	6.2″	20″
305/35R24	32.4″	+1.1%	12.0″	4.2″	24″
265/75R16	31.6″	−1.3%	10.4″	7.8″	16″
265/70R17	31.6″	−1.4%	10.4″	7.3″	17″
305/40R22	31.6″	−1.4%	12.0″	4.8″	22″
265/65R18	31.6″	−1.5%	10.4″	6.8″	18″

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.
75: Aspect ratio: the sidewall is 75% as tall as the tire is wide, 191 mm (7.5 in).
R: Radial construction, used by almost every modern tire.
17: Fits a 17-inch wheel.

255/75R17 is about 32.1 inches tall and 10.0 inches wide, on a 17-inch wheel, roughly a 32.1x10.0R17 in inch sizing.

Yes. At 32.1 inches it is sold and fitted as a 32-inch tire.

255/70R18, 275/65R18, 285/45R22 are the closest common sizes, all within 0.1% of its diameter, so the speedometer stays close to accurate.

285/75R17 is 5.5% taller, so at an indicated 60 mph you would really be doing 63.3 mph. Compare 255/75R17 and 285/75R17.

About 629 per mile (391 per km), from a 100.7-inch circumference.