245/45R17
A 245/45R17 tire is 25.68 inches tall and 9.6 inches wide, with a 4.34-inch sidewall, mounted on a 17-inch wheel.
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 in inches and millimeters
Every dimension of a 245/45R17, converted both ways. Calculated from the size code, accurate to about 1%.
| Measurement | Inches | Millimeters |
|---|---|---|
| Overall diameter (height) | 25.68″ | 652 mm |
| Tread width | 9.6″ | 245 mm |
| Sidewall height | 4.34″ | 110.3 mm |
| Wheel diameter | 17″ | 432 mm |
| Circumference | 80.68″ | 2049 mm |
Nominal dimensions from the size code. A real tire varies by a few millimeters between manufacturers, and a loaded tire sits slightly shorter than its free diameter.
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% · This fits
245/45R17 → 205/60R16
205/60R16
Diameter −0.0% · This fits
245/45R17 → 205/50R17
205/50R17
Diameter +2.4% · This fits
245/45R17 → 215/45R17
215/45R17
Diameter +4.3% · Borderline. Check clearance first
245/45R17 → 215/50R17
215/50R17
Diameter +0.9% · This fits
245/45R17 → 215/55R17
215/55R17
Diameter −2.4% · This fits
245/45R17 → 225/45R17
225/45R17
Diameter +2.8% · This fits
245/45R17 → 225/50R17
225/50R17
Diameter −0.7% · This fits
245/45R17 → 225/55R17
225/55R17
Diameter −4.0% · Borderline. Check clearance first
245/45R17 → 235/45R17
235/45R17
Diameter +1.4% · This fits
225/50R17 → 245/45R17
225/50R17
Diameter +0.7% · This fits
215/50R17 → 245/45R17
215/50R17
Diameter −0.8% · This fits
235/45R17 → 245/45R17
235/45R17
Diameter −1.4% · This fits
205/50R17 → 245/45R17
205/50R17
Diameter −2.4% · This fits
215/55R17 → 245/45R17
215/55R17
Diameter +2.5% · This fits
225/45R17 → 245/45R17
225/45R17
Diameter −2.8% · This fits
245/40R18 → 245/45R17
245/40R18
Diameter +0.1% · This fits
245/35R19 → 245/45R17
245/35R19
Diameter +0.3% · This fits
215/45R17 → 245/45R17
215/45R17
Diameter −4.1% · Borderline. Check clearance first
225/55R17 → 245/45R17
225/55R17
Diameter +4.1% · Borderline. Check clearance first
205/60R16 → 245/45R17
205/60R16
Diameter +0.0% · This fits
205/65R15 → 245/45R17
205/65R15
Diameter −0.7% · This fits
235/40R18 → 245/45R17
235/40R18
Diameter −1.1% · This fits
225/45R18 → 245/45R17
225/45R18
Diameter +1.1% · This fits
245/45R17 → 225/40R18
225/40R18
Diameter +2.4% · This fits
245/45R17 → 225/45R18
225/45R18
Diameter −1.1% · This fits
245/45R17 → 235/40R18
235/40R18
Diameter +1.1% · This fits
245/45R17 → 245/40R18
245/40R18
Diameter −0.1% · This fits
245/45R17 → 245/35R19
245/35R19
Diameter −0.3% · This fits
245/45R17 → 255/35R19
255/35R19
Diameter −1.3% · This fits
245/45R17 → 215/60R17
215/60R17
Diameter −5.4% · Too big a jump
245/45R17 → 255/40R18
255/40R18
Diameter −1.3% · This fits
Common questions
- What is 245/45R17 in inches?
- A 245/45R17 tire is 25.68 inches tall and 9.6 inches wide, with a 4.34-inch sidewall, mounted on a 17-inch wheel. In metric that is 652 mm tall and 245 mm wide. The circumference is 80.68 inches.
- How tall is a 245/45R17 tire?
- 25.68 inches, or 652 mm. That is the overall diameter, wheel included. It turns about 785 times per mile, which is what your speedometer counts.
- What do the numbers in 245/45R17 mean?
- 245 is the tread width in millimeters, 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.