305/45R22
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 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% · Good fit
305/45R22 → 275/65R20
275/65R20
Diameter −3.7% · Marginal fit — proceed with care
305/45R22 → 285/65R20
285/65R20
Diameter −5.1% · Not recommended
305/45R22 → 295/60R20
295/60R20
Diameter −3.3% · Marginal fit — proceed with care
305/45R22 → 305/50R20
305/50R20
Diameter +2.5% · Good fit
305/45R22 → 305/55R20
305/55R20
Diameter −1.2% · Good fit
305/45R22 → 275/50R22
275/50R22
Diameter −0.1% · Good fit
305/45R22 → 285/45R22
285/45R22
Diameter +2.2% · Good fit
305/45R22 → 285/50R22
285/50R22
Diameter −1.2% · Good fit
275/50R22 → 305/45R22
275/50R22
Diameter +0.1% · Good fit
285/50R22 → 305/45R22
285/50R22
Diameter +1.3% · Good fit
285/45R22 → 305/45R22
285/45R22
Diameter −2.2% · Good fit
305/55R20 → 305/45R22
305/55R20
Diameter +1.2% · Good fit
275/60R20 → 305/45R22
275/60R20
Diameter +0.6% · Good fit
265/60R20 → 305/45R22
265/60R20
Diameter −0.9% · Good fit
305/50R20 → 305/45R22
305/50R20
Diameter −2.4% · Good fit
285/55R20 → 305/45R22
285/55R20
Diameter −1.4% · Good fit
285/60R20 → 305/45R22
285/60R20
Diameter +2.0% · Good fit
275/55R20 → 305/45R22
275/55R20
Diameter −2.7% · Good fit
275/50R21 → 305/45R22
275/50R21
Diameter −3.0% · Good fit
295/60R20 → 305/45R22
295/60R20
Diameter +3.4% · Marginal fit — proceed with care
275/65R20 → 305/45R22
275/65R20
Diameter +3.9% · Marginal fit — proceed with care
265/55R20 → 305/45R22
265/55R20
Diameter −4.1% · Marginal fit — proceed with care
Common questions
- What is the overall diameter of a 305/45R22 tire?
- A 305/45R22 tire is about 32.81″ (833 mm) in overall diameter, with a sidewall height of 137.3 mm and a circumference of 103.07″.
- How many revolutions per mile does a 305/45R22 tire turn?
- A 305/45R22 turns roughly 615 revolutions per mile (382 per kilometre). This is the number that determines speedometer and odometer accuracy when you change tire size.
- What do the numbers in 305/45R22 mean?
- 305 is the tread width in millimetres, 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.