315/70R17 tire size

A 315/70R17 tire is 34.4 inches (873 mm) tall and 12.4 inches (315 mm) wide, and fits a 17-inch wheel. In inch sizing it is about a 34.4x12.4R17.

Overall diameter34.36in873 mm

Drawn to scale from the nominal size.

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Size	Diameter	Difference	Width	Sidewall	Wheel
295/70R18	34.3″	−0.3%	11.6″	8.1″	18″
315/75R16	34.6″	+0.7%	12.4″	9.3″	16″
275/65R20	34.1″	−0.8%	10.8″	7.0″	20″
295/60R20	33.9″	−1.2%	11.6″	7.0″	20″
285/75R18	34.8″	+1.4%	11.2″	8.4″	18″
285/75R17	33.8″	−1.5%	11.2″	8.4″	17″
35x12.50R15	35.0″	+1.9%	12.5″	10.0″	15″
35x12.50R17	35.0″	+1.9%	12.5″	9.0″	17″
35x12.50R18	35.0″	+1.9%	12.5″	8.5″	18″
35x12.50R20	35.0″	+1.9%	12.5″	7.5″	20″
35x12.50R22	35.0″	+1.9%	12.5″	6.5″	22″
35x12.50R24	35.0″	+1.9%	12.5″	5.5″	24″

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

315: Section width: 315 mm (12.4 in) from sidewall to sidewall.
70: Aspect ratio: the sidewall is 70% as tall as the tire is wide, 221 mm (8.7 in).
R: Radial construction, used by almost every modern tire.
17: Fits a 17-inch wheel.

315/70R17 is about 34.4 inches tall and 12.4 inches wide, on a 17-inch wheel, roughly a 34.4x12.4R17 in inch sizing.

Nearly. It measures 34.4 inches, so it falls between 34 and 35 inches.

295/70R18, 315/75R16, 275/65R20 are the closest common sizes, all within 0.8% of its diameter, so the speedometer stays close to accurate.

37x12.50R17 is 7.7% taller, so at an indicated 60 mph you would really be doing 64.6 mph. Compare 315/70R17 and 37x12.50R17.

About 587 per mile (365 per km), from a 108.0-inch circumference.