305/70R17
A 305/70R17 tire is 33.81 inches tall and 12.0 inches wide, with a 8.41-inch sidewall, mounted on a 17-inch wheel.
Overall diameter
33.81″
859 mm
Sidewall height
8.41″
213.5 mm
Tread width
305 mm
12.0″
Circumference
106.22″
8.9 ft
Revs per mile
596
371 per km
Wheel diameter
17″
aspect ratio 70%
Cross-section
- Overall diameter
- 33.81″
- Sidewall (each side)
- 8.41″
- Wheel
- 17″
305/70R17 in inches and millimeters
Every dimension of a 305/70R17, converted both ways. Calculated from the size code, accurate to about 1%.
| Measurement | Inches | Millimeters |
|---|---|---|
| Overall diameter (height) | 33.81″ | 859 mm |
| Tread width | 12.0″ | 305 mm |
| Sidewall height | 8.41″ | 213.5 mm |
| Wheel diameter | 17″ | 432 mm |
| Circumference | 106.22″ | 2698 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.
305/70R17 compared with other sizes
All 20 practical swaps involving 305/70R17 — diameter change, speedometer impact and a fit verdict for each.
305/70R17 → 285/75R16
285/75R16
Diameter +3.0% · This fits
305/70R17 → 275/70R17
275/70R17
Diameter +5.1% · Too big a jump
305/70R17 → 285/70R17
285/70R17
Diameter +3.4% · Borderline. Check clearance first
305/70R17 → 305/65R17
305/65R17
Diameter +3.7% · Borderline. Check clearance first
315/70R17 → 305/70R17
315/70R17
Diameter +1.6% · This fits
305/65R17 → 305/70R17
305/65R17
Diameter −3.6% · Borderline. Check clearance first
285/70R17 → 305/70R17
285/70R17
Diameter −3.3% · Borderline. Check clearance first
275/70R17 → 305/70R17
275/70R17
Diameter −4.9% · Borderline. Check clearance first
285/70R18 → 305/70R17
285/70R18
Diameter −0.3% · This fits
295/70R18 → 305/70R17
295/70R18
Diameter +1.3% · This fits
275/70R18 → 305/70R17
275/70R18
Diameter −1.9% · This fits
305/60R18 → 305/70R17
305/60R18
Diameter −4.1% · Borderline. Check clearance first
285/75R16 → 305/70R17
285/75R16
Diameter −2.9% · This fits
265/70R18 → 305/70R17
265/70R18
Diameter −3.6% · Borderline. Check clearance first
285/65R18 → 305/70R17
285/65R18
Diameter −3.6% · Borderline. Check clearance first
275/65R18 → 305/70R17
275/65R18
Diameter −5.1% · Too big a jump
305/70R17 → 315/70R17
315/70R17
Diameter −1.6% · This fits
305/70R17 → 285/70R18
285/70R18
Diameter +0.3% · This fits
305/70R17 → 295/70R18
295/70R18
Diameter −1.3% · This fits
305/70R17 → 225/45R17
225/45R17
Diameter +35.4% · Too big a jump
Common questions
- What is 305/70R17 in inches?
- A 305/70R17 tire is 33.81 inches tall and 12.0 inches wide, with a 8.41-inch sidewall, mounted on a 17-inch wheel. In metric that is 859 mm tall and 305 mm wide. The circumference is 106.22 inches.
- How tall is a 305/70R17 tire?
- 33.81 inches, or 859 mm. That is the overall diameter, wheel included. It turns about 596 times per mile, which is what your speedometer counts.
- What do the numbers in 305/70R17 mean?
- 305 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 305 × 70% = 213.5 mm tall.