265/60R18 tire size

A 265/60R18 tire is 30.5 inches (775 mm) tall and 10.4 inches (265 mm) wide, and fits a 18-inch wheel. In inch sizing it is about a 30.5x10.4R18.

Overall diameter30.52in775 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
245/70R17	30.5″	−0.1%	9.6″	6.8″	17″
265/65R17	30.6″	+0.1%	10.4″	6.8″	17″
245/75R16	30.5″	−0.2%	9.6″	7.2″	16″
265/70R16	30.6″	+0.3%	10.4″	7.3″	16″
265/50R20	30.4″	−0.3%	10.4″	5.2″	20″
275/40R22	30.7″	+0.5%	10.8″	4.3″	22″
265/40R22	30.3″	−0.6%	10.4″	4.2″	22″
275/45R21	30.7″	+0.7%	10.8″	4.9″	21″
235/55R20	30.2″	−1.1%	9.3″	5.1″	20″
235/75R17	30.9″	+1.2%	9.3″	6.9″	17″
255/70R16	30.1″	−1.5%	10.0″	7.0″	16″
255/65R17	30.1″	−1.5%	10.0″	6.5″	17″

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

265: Section width: 265 mm (10.4 in) from sidewall to sidewall.
60: Aspect ratio: the sidewall is 60% as tall as the tire is wide, 159 mm (6.3 in).
R: Radial construction, used by almost every modern tire.
18: Fits a 18-inch wheel.

265/60R18 is about 30.5 inches tall and 10.4 inches wide, on a 18-inch wheel, roughly a 30.5x10.4R18 in inch sizing.

Nearly. It measures 30.5 inches, so it falls between 30 and 31 inches.

245/70R17, 265/65R17, 245/75R16 are the closest common sizes, all within 0.2% of its diameter, so the speedometer stays close to accurate.

265/65R18 is 3.4% taller, so at an indicated 60 mph you would really be doing 62.1 mph. Compare 265/60R18 and 265/65R18.

About 661 per mile (411 per km), from a 95.9-inch circumference.