245/45R17
Common fitments: Mustang GT, Challenger
Overall diameter
25.68″
652 mm
Sidewall height
4.34″
110.3 mm
Tread width
245 mm
9.6″
Circumference
80.68″
6.7 ft
Revs per mile
785
488 per km
Wheel diameter
17″
aspect ratio 45%
Cross-section
- Overall diameter
- 25.68″
- Sidewall (each side)
- 4.34″
- Wheel
- 17″
245/45R17 compared with other sizes
All 32 practical swaps involving 245/45R17 — diameter change, speedometer impact and a fit verdict for each.
245/45R17 → 205/65R15
205/65R15
Diameter +0.7% · Good fit
245/45R17 → 205/60R16
205/60R16
Diameter −0.0% · Good fit
245/45R17 → 205/50R17
205/50R17
Diameter +2.4% · Good fit
245/45R17 → 215/45R17
215/45R17
Diameter +4.3% · Marginal fit — proceed with care
245/45R17 → 215/50R17
215/50R17
Diameter +0.9% · Good fit
245/45R17 → 215/55R17
215/55R17
Diameter −2.4% · Good fit
245/45R17 → 225/45R17
225/45R17
Diameter +2.8% · Good fit
245/45R17 → 225/50R17
225/50R17
Diameter −0.7% · Good fit
245/45R17 → 225/55R17
225/55R17
Diameter −4.0% · Marginal fit — proceed with care
245/45R17 → 235/45R17
235/45R17
Diameter +1.4% · Good fit
225/50R17 → 245/45R17
225/50R17
Diameter +0.7% · Good fit
215/50R17 → 245/45R17
215/50R17
Diameter −0.8% · Good fit
235/45R17 → 245/45R17
235/45R17
Diameter −1.4% · Good fit
205/50R17 → 245/45R17
205/50R17
Diameter −2.4% · Good fit
215/55R17 → 245/45R17
215/55R17
Diameter +2.5% · Good fit
225/45R17 → 245/45R17
225/45R17
Diameter −2.8% · Good fit
245/40R18 → 245/45R17
245/40R18
Diameter +0.1% · Good fit
245/35R19 → 245/45R17
245/35R19
Diameter +0.3% · Good fit
215/45R17 → 245/45R17
215/45R17
Diameter −4.1% · Marginal fit — proceed with care
225/55R17 → 245/45R17
225/55R17
Diameter +4.1% · Marginal fit — proceed with care
205/60R16 → 245/45R17
205/60R16
Diameter +0.0% · Good fit
205/65R15 → 245/45R17
205/65R15
Diameter −0.7% · Good fit
235/40R18 → 245/45R17
235/40R18
Diameter −1.1% · Good fit
225/45R18 → 245/45R17
225/45R18
Diameter +1.1% · Good fit
245/45R17 → 225/40R18
225/40R18
Diameter +2.4% · Good fit
245/45R17 → 225/45R18
225/45R18
Diameter −1.1% · Good fit
245/45R17 → 235/40R18
235/40R18
Diameter +1.1% · Good fit
245/45R17 → 245/40R18
245/40R18
Diameter −0.1% · Good fit
245/45R17 → 245/35R19
245/35R19
Diameter −0.3% · Good fit
245/45R17 → 255/35R19
255/35R19
Diameter −1.3% · Good fit
245/45R17 → 215/60R17
215/60R17
Diameter −5.4% · Not recommended
245/45R17 → 255/40R18
255/40R18
Diameter −1.3% · Good fit
Common questions
- What is the overall diameter of a 245/45R17 tire?
- A 245/45R17 tire is about 25.68″ (652 mm) in overall diameter, with a sidewall height of 110.3 mm and a circumference of 80.68″.
- How many revolutions per mile does a 245/45R17 tire turn?
- A 245/45R17 turns roughly 785 revolutions per mile (488 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.
- What do the numbers in 245/45R17 mean?
- 245 is the tread width in millimetres, 45 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 × 45% = 110.3 mm tall.