TireSizeCheck

315/70R17

Overall diameter

34.36″

873 mm

Sidewall height

8.68″

220.5 mm

Tread width

315 mm

12.4″

Circumference

107.95″

9.0 ft

Revs per mile

587

365 per km

Wheel diameter

17″

aspect ratio 70%

Cross-section

Overall diameter
34.36″
Sidewall (each side)
8.68″
Wheel
17″

Common questions

What is the overall diameter of a 315/70R17 tire?
A 315/70R17 tire is about 34.36″ (873 mm) in overall diameter, with a sidewall height of 220.5 mm and a circumference of 107.95″.
How many revolutions per mile does a 315/70R17 tire turn?
A 315/70R17 turns roughly 587 revolutions per mile (365 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.
What do the numbers in 315/70R17 mean?
315 is the tread width in millimetres, 70 is the aspect ratio — the sidewall height as a percentage of the tread width — and 17 is the wheel diameter in inches. So the sidewall is 315 × 70% = 220.5 mm tall.