245/70R17
Overall diameter
30.50″
775 mm
Sidewall height
6.75″
171.5 mm
Tread width
245 mm
9.6″
Circumference
95.83″
8.0 ft
Revs per mile
661
411 per km
Wheel diameter
17″
aspect ratio 70%
Cross-section
- Overall diameter
- 30.50″
- Sidewall (each side)
- 6.75″
- Wheel
- 17″
245/70R17 compared with other sizes
All 33 practical swaps involving 245/70R17 — diameter change, speedometer impact and a fit verdict for each.
245/70R17 → 245/75R16
245/75R16
Diameter +0.1% · Good fit
245/70R17 → 265/70R16
265/70R16
Diameter −0.3% · Good fit
245/70R17 → 265/70R17
265/70R17
Diameter −3.5% · Marginal fit — proceed with care
245/70R17 → 265/70R15
265/70R15
Diameter +3.0% · Marginal fit — proceed with care
245/70R17 → 265/75R15
265/75R15
Diameter −0.5% · Good fit
245/70R17 → 255/70R16
255/70R16
Diameter +1.5% · Good fit
245/70R17 → 235/65R17
235/65R17
Diameter +5.1% · Not recommended
245/70R17 → 235/80R17
235/80R17
Diameter −4.1% · Marginal fit — proceed with care
245/70R17 → 245/65R17
245/65R17
Diameter +3.3% · Marginal fit — proceed with care
265/65R17 → 245/70R17
265/65R17
Diameter +0.2% · Good fit
255/65R17 → 245/70R17
255/65R17
Diameter −1.5% · Good fit
255/70R17 → 245/70R17
255/70R17
Diameter +1.8% · Good fit
275/65R17 → 245/70R17
275/65R17
Diameter +1.9% · Good fit
245/65R17 → 245/70R17
245/65R17
Diameter −3.2% · Marginal fit — proceed with care
245/75R17 → 245/70R17
245/75R17
Diameter +3.2% · Marginal fit — proceed with care
265/70R17 → 245/70R17
265/70R17
Diameter +3.6% · Marginal fit — proceed with care
245/75R16 → 245/70R17
245/75R16
Diameter −0.1% · Good fit
245/65R18 → 245/70R17
245/65R18
Diameter +0.1% · Good fit
235/80R17 → 245/70R17
235/80R17
Diameter +4.3% · Marginal fit — proceed with care
235/65R17 → 245/70R17
235/65R17
Diameter −4.8% · Marginal fit — proceed with care
265/60R18 → 245/70R17
265/60R18
Diameter +0.1% · Good fit
265/55R19 → 245/70R17
265/55R19
Diameter −0.1% · Good fit
255/75R17 → 245/70R17
255/75R17
Diameter +5.1% · Not recommended
245/70R17 → 245/75R17
245/75R17
Diameter −3.1% · Marginal fit — proceed with care
245/70R17 → 255/65R17
255/65R17
Diameter +1.5% · Good fit
245/70R17 → 255/70R17
255/70R17
Diameter −1.8% · Good fit
245/70R17 → 255/75R17
255/75R17
Diameter −4.9% · Marginal fit — proceed with care
245/70R17 → 265/65R17
265/65R17
Diameter −0.2% · Good fit
245/70R17 → 275/65R17
275/65R17
Diameter −1.8% · Good fit
245/70R17 → 275/70R17
275/70R17
Diameter −5.1% · Not recommended
245/70R17 → 245/65R18
245/65R18
Diameter −0.1% · Good fit
245/70R17 → 265/55R19
265/55R19
Diameter +0.1% · Good fit
245/70R17 → 225/45R17
225/45R17
Diameter +22.2% · Not recommended
Common questions
- What is the overall diameter of a 245/70R17 tire?
- A 245/70R17 tire is about 30.50″ (775 mm) in overall diameter, with a sidewall height of 171.5 mm and a circumference of 95.83″.
- How many revolutions per mile does a 245/70R17 tire turn?
- A 245/70R17 turns roughly 661 revolutions per mile (411 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.
- What do the numbers in 245/70R17 mean?
- 245 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 245 × 70% = 171.5 mm tall.