175/65R15 tire size

A 175/65R15 tire is 24.0 inches (609 mm) tall and 6.9 inches (175 mm) wide, and fits a 15-inch wheel. In inch sizing it is about a 24.0x6.9R15.

Overall diameter23.96in609 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
185/55R16	24.0″	+0.2%	7.3″	4.0″	16″
205/55R15	23.9″	−0.3%	8.1″	4.4″	15″
205/50R16	24.1″	+0.5%	8.1″	4.0″	16″
185/60R15	23.7″	−0.9%	7.3″	4.4″	15″
185/70R14	24.2″	+1.0%	7.3″	5.1″	14″
195/60R15	24.2″	+1.1%	7.7″	4.6″	15″
195/50R16	23.7″	−1.2%	7.7″	3.8″	16″
175/70R14	23.6″	−1.3%	6.9″	4.8″	14″
195/55R16	24.4″	+2.0%	7.7″	4.2″	16″
185/65R14	23.5″	−2.0%	7.3″	4.7″	14″
185/65R15	24.5″	+2.1%	7.3″	4.7″	15″
195/55R15	23.4″	−2.1%	7.7″	4.2″	15″

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

175: Section width: 175 mm (6.9 in) from sidewall to sidewall.
65: Aspect ratio: the sidewall is 65% as tall as the tire is wide, 114 mm (4.5 in).
R: Radial construction, used by almost every modern tire.
15: Fits a 15-inch wheel.

175/65R15 is about 24.0 inches tall and 6.9 inches wide, on a 15-inch wheel, roughly a 24.0x6.9R15 in inch sizing.

Yes. At 24.0 inches it is sold and fitted as a 24-inch tire.

185/55R16, 205/55R15, 205/50R16 are the closest common sizes, all within 0.5% of its diameter, so the speedometer stays close to accurate.

205/60R15 is 3.0% taller, so at an indicated 60 mph you would really be doing 61.8 mph. Compare 175/65R15 and 205/60R15.

About 842 per mile (523 per km), from a 75.3-inch circumference.