305/45R22
A 305/45R22 tire is 32.81 inches tall and 12.0 inches wide, with a 5.40-inch sidewall, mounted on a 22-inch wheel.
Overall diameter
32.81″
833 mm
Sidewall height
5.40″
137.3 mm
Tread width
305 mm
12.0″
Circumference
103.07″
8.6 ft
Revs per mile
615
382 per km
Wheel diameter
22″
aspect ratio 45%
Cross-section
- Overall diameter
- 32.81″
- Sidewall (each side)
- 5.40″
- Wheel
- 22″
305/45R22 in inches and millimeters
Every dimension of a 305/45R22, converted both ways. Calculated from the size code, accurate to about 1%.
| Measurement | Inches | Millimeters |
|---|---|---|
| Overall diameter (height) | 32.81″ | 833 mm |
| Tread width | 12.0″ | 305 mm |
| Sidewall height | 5.40″ | 137.3 mm |
| Wheel diameter | 22″ | 559 mm |
| Circumference | 103.07″ | 2618 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.
305/45R22 compared with other sizes
All 23 practical swaps involving 305/45R22 — diameter change, speedometer impact and a fit verdict for each.
305/45R22 → 275/60R20
275/60R20
Diameter −0.6% · This fits
305/45R22 → 275/65R20
275/65R20
Diameter −3.7% · Borderline. Check clearance first
305/45R22 → 285/65R20
285/65R20
Diameter −5.1% · Too big a jump
305/45R22 → 295/60R20
295/60R20
Diameter −3.3% · Borderline. Check clearance first
305/45R22 → 305/50R20
305/50R20
Diameter +2.5% · This fits
305/45R22 → 305/55R20
305/55R20
Diameter −1.2% · This fits
305/45R22 → 275/50R22
275/50R22
Diameter −0.1% · This fits
305/45R22 → 285/45R22
285/45R22
Diameter +2.2% · This fits
305/45R22 → 285/50R22
285/50R22
Diameter −1.2% · This fits
275/50R22 → 305/45R22
275/50R22
Diameter +0.1% · This fits
285/50R22 → 305/45R22
285/50R22
Diameter +1.3% · This fits
285/45R22 → 305/45R22
285/45R22
Diameter −2.2% · This fits
305/55R20 → 305/45R22
305/55R20
Diameter +1.2% · This fits
275/60R20 → 305/45R22
275/60R20
Diameter +0.6% · This fits
265/60R20 → 305/45R22
265/60R20
Diameter −0.9% · This fits
305/50R20 → 305/45R22
305/50R20
Diameter −2.4% · This fits
285/55R20 → 305/45R22
285/55R20
Diameter −1.4% · This fits
285/60R20 → 305/45R22
285/60R20
Diameter +2.0% · This fits
275/55R20 → 305/45R22
275/55R20
Diameter −2.7% · This fits
275/50R21 → 305/45R22
275/50R21
Diameter −3.0% · This fits
295/60R20 → 305/45R22
295/60R20
Diameter +3.4% · Borderline. Check clearance first
275/65R20 → 305/45R22
275/65R20
Diameter +3.9% · Borderline. Check clearance first
265/55R20 → 305/45R22
265/55R20
Diameter −4.1% · Borderline. Check clearance first
Common questions
- What is 305/45R22 in inches?
- A 305/45R22 tire is 32.81 inches tall and 12.0 inches wide, with a 5.40-inch sidewall, mounted on a 22-inch wheel. In metric that is 833 mm tall and 305 mm wide. The circumference is 103.07 inches.
- How tall is a 305/45R22 tire?
- 32.81 inches, or 833 mm. That is the overall diameter, wheel included. It turns about 615 times per mile, which is what your speedometer counts.
- What do the numbers in 305/45R22 mean?
- 305 is the tread width in millimeters, 45 is the aspect ratio — the sidewall height as a percentage of the tread width — and 22 is the wheel diameter in inches. So the sidewall is 305 × 45% = 137.3 mm tall.