245/70R17
A 245/70R17 tire is 30.50 inches tall and 9.6 inches wide, with a 6.75-inch sidewall, mounted on a 17-inch wheel.
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 in inches and millimeters
Every dimension of a 245/70R17, converted both ways. Calculated from the size code, accurate to about 1%.
| Measurement | Inches | Millimeters |
|---|---|---|
| Overall diameter (height) | 30.50″ | 775 mm |
| Tread width | 9.6″ | 245 mm |
| Sidewall height | 6.75″ | 171.5 mm |
| Wheel diameter | 17″ | 432 mm |
| Circumference | 95.83″ | 2434 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.
245/70R17 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% · This fits
245/70R17 → 265/70R16
265/70R16
Diameter −0.3% · This fits
245/70R17 → 265/70R17
265/70R17
Diameter −3.5% · Borderline. Check clearance first
245/70R17 → 265/70R15
265/70R15
Diameter +3.0% · Borderline. Check clearance first
245/70R17 → 265/75R15
265/75R15
Diameter −0.5% · This fits
245/70R17 → 255/70R16
255/70R16
Diameter +1.5% · This fits
245/70R17 → 235/65R17
235/65R17
Diameter +5.1% · Too big a jump
245/70R17 → 235/80R17
235/80R17
Diameter −4.1% · Borderline. Check clearance first
245/70R17 → 245/65R17
245/65R17
Diameter +3.3% · Borderline. Check clearance first
265/65R17 → 245/70R17
265/65R17
Diameter +0.2% · This fits
255/65R17 → 245/70R17
255/65R17
Diameter −1.5% · This fits
255/70R17 → 245/70R17
255/70R17
Diameter +1.8% · This fits
275/65R17 → 245/70R17
275/65R17
Diameter +1.9% · This fits
245/65R17 → 245/70R17
245/65R17
Diameter −3.2% · Borderline. Check clearance first
245/75R17 → 245/70R17
245/75R17
Diameter +3.2% · Borderline. Check clearance first
265/70R17 → 245/70R17
265/70R17
Diameter +3.6% · Borderline. Check clearance first
245/75R16 → 245/70R17
245/75R16
Diameter −0.1% · This fits
245/65R18 → 245/70R17
245/65R18
Diameter +0.1% · This fits
235/80R17 → 245/70R17
235/80R17
Diameter +4.3% · Borderline. Check clearance first
235/65R17 → 245/70R17
235/65R17
Diameter −4.8% · Borderline. Check clearance first
265/60R18 → 245/70R17
265/60R18
Diameter +0.1% · This fits
265/55R19 → 245/70R17
265/55R19
Diameter −0.1% · This fits
255/75R17 → 245/70R17
255/75R17
Diameter +5.1% · Too big a jump
245/70R17 → 245/75R17
245/75R17
Diameter −3.1% · Borderline. Check clearance first
245/70R17 → 255/65R17
255/65R17
Diameter +1.5% · This fits
245/70R17 → 255/70R17
255/70R17
Diameter −1.8% · This fits
245/70R17 → 255/75R17
255/75R17
Diameter −4.9% · Borderline. Check clearance first
245/70R17 → 265/65R17
265/65R17
Diameter −0.2% · This fits
245/70R17 → 275/65R17
275/65R17
Diameter −1.8% · This fits
245/70R17 → 275/70R17
275/70R17
Diameter −5.1% · Too big a jump
245/70R17 → 245/65R18
245/65R18
Diameter −0.1% · This fits
245/70R17 → 265/55R19
265/55R19
Diameter +0.1% · This fits
245/70R17 → 225/45R17
225/45R17
Diameter +22.2% · Too big a jump
Common questions
- What is 245/70R17 in inches?
- A 245/70R17 tire is 30.50 inches tall and 9.6 inches wide, with a 6.75-inch sidewall, mounted on a 17-inch wheel. In metric that is 775 mm tall and 245 mm wide. The circumference is 95.83 inches.
- How tall is a 245/70R17 tire?
- 30.50 inches, or 775 mm. That is the overall diameter, wheel included. It turns about 661 times per mile, which is what your speedometer counts.
- What do the numbers in 245/70R17 mean?
- 245 is the tread width in millimeters, 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.