31.6" tall, 12.0" wide, 4.8" sidewall
A 305/40R22 tire is 31.6 inches (803 mm) tall and 12.0 inches wide. The sidewall is 40% of the width, 4.8 inches, on a 22-inch wheel, and the tire turns about 638 times per mile.
In flotation terms that is about 31.6x12.0R22. People often call it a 32-inch tire.
The size most often compared with it is 305/45R22, which is 1.2" taller (+3.8%). At an indicated 60 mph you would be doing 62.3 mph on it, more than the 3% change many shops use as a limit.
| Current | New | Difference |
|---|
| Shows | Actual speed |
|---|
Same 22" wheel, within 20 mm of width and 10 points of aspect ratio.
| Size | Diameter | Width | Sidewall | vs 305/40R22 | |
|---|---|---|---|---|---|
| 295/40R22 | 31.3" | 11.6" | 4.6" | −1.0% | |
| 315/40R22 | 31.9" | 12.4" | 5.0" | +1.0% | |
| 325/40R22 | 32.2" | 12.8" | 5.1" | +2.0% | |
| 285/40R22 | 31.0" | 11.2" | 4.5" | −2.0% | |
| 325/35R22 | 31.0" | 12.8" | 4.5" | −2.1% | |
| 295/45R22 | 32.5" | 11.6" | 5.2" | +2.7% | |
| 305/35R22 | 30.4" | 12.0" | 4.2" | −3.8% | compare |
| 305/45R22 | 32.8" | 12.0" | 5.4" | +3.8% | compare |
| 33x12.50R22 | 33.0" | 12.5" | 5.5" | +4.4% | |
| 295/35R22 | 30.1" | 11.6" | 4.1" | −4.7% |
Sizes within 2% of 31.6" on 20" or 24" wheels.
| Size | Diameter | Width | Sidewall | vs 305/40R22 | |
|---|---|---|---|---|---|
| 295/50R20 | 31.6" | 11.6" | 5.8" | +0.0% | |
| 275/35R24 | 31.6" | 10.8" | 3.8" | −0.1% | |
| 245/60R20 | 31.6" | 9.6" | 5.8" | −0.1% | |
| 265/55R20 | 31.5" | 10.4" | 5.7" | −0.4% | |
| 285/35R24 | 31.9" | 11.2" | 3.9" | +0.8% | |
| 275/55R20 | 31.9" | 10.8" | 6.0" | +1.0% |
Actual speed when the speedometer is calibrated for 305/40R22.
| Speedometer shows | on 305/45R22 | on 305/35R22 | on 295/40R22 |
|---|---|---|---|
| 30 mph | 31.1 mph | 28.9 mph | 29.7 mph |
| 45 mph | 46.7 mph | 43.3 mph | 44.6 mph |
| 60 mph | 62.3 mph | 57.7 mph | 59.4 mph |
| 70 mph | 72.7 mph | 67.3 mph | 69.3 mph |
31.6 inches (803 mm). The sidewall is 4.8 inches.
12.0 inches (305 mm) section width, measured sidewall to sidewall.
About 31.6x12.0R22.
305/45R22 is +3.8% in diameter, more than the common 3% guideline, so expect a speedometer error and check clearance. It is 0.0" wider.