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″
315/70R17 compared with other sizes
All 13 practical swaps involving 315/70R17 — diameter change, speedometer impact and a fit verdict for each.
315/70R17 → 285/70R17
285/70R17
Diameter +5.1% · Not recommended
315/70R17 → 305/65R17
305/65R17
Diameter +5.4% · Not recommended
315/70R17 → 305/70R17
305/70R17
Diameter +1.6% · Good fit
305/70R17 → 315/70R17
305/70R17
Diameter −1.6% · Good fit
285/70R17 → 315/70R17
285/70R17
Diameter −4.8% · Marginal fit — proceed with care
305/65R17 → 315/70R17
305/65R17
Diameter −5.1% · Not recommended
295/70R18 → 315/70R17
295/70R18
Diameter −0.3% · Good fit
285/70R18 → 315/70R17
285/70R18
Diameter −1.9% · Good fit
275/70R18 → 315/70R17
275/70R18
Diameter −3.5% · Marginal fit — proceed with care
285/75R16 → 315/70R17
285/75R16
Diameter −4.5% · Marginal fit — proceed with care
285/65R18 → 315/70R17
285/65R18
Diameter −5.2% · Not recommended
315/70R17 → 295/70R18
295/70R18
Diameter +0.3% · Good fit
315/70R17 → 225/45R17
225/45R17
Diameter +37.6% · Not recommended
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.