32.2" tall, 12.8" wide, 5.1" sidewall
A 325/40R22 tire is 32.2 inches (819 mm) tall and 12.8 inches wide. The sidewall is 40% of the width, 5.1 inches, on a 22-inch wheel, and the tire turns about 626 times per mile.
In flotation terms that is about 32.2x12.8R22. People often call it a 32-inch tire.
The size most often compared with it is 315/40R22, which is 0.3" shorter (−1.0%). At an indicated 60 mph you would be doing 59.4 mph on it.
| 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 325/40R22 | |
|---|---|---|---|---|---|
| 315/40R22 | 31.9" | 12.4" | 5.0" | −1.0% | |
| 305/45R22 | 32.8" | 12.0" | 5.4" | +1.8% | |
| 305/40R22 | 31.6" | 12.0" | 4.8" | −2.0% | |
| 33x12.50R22 | 33.0" | 12.5" | 5.5" | +2.4% | |
| 315/45R22 | 33.2" | 12.4" | 5.6" | +2.9% | |
| 325/35R22 | 31.0" | 12.8" | 4.5" | −4.0% | |
| 325/45R22 | 33.5" | 12.8" | 5.8" | +4.0% | |
| 305/50R22 | 34.0" | 12.0" | 6.0" | +5.5% | |
| 305/35R22 | 30.4" | 12.0" | 4.2" | −5.7% | |
| 315/50R22 | 34.4" | 12.4" | 6.2" | +6.7% |
Sizes within 2% of 32.2" on 20" or 24" wheels.
| Size | Diameter | Width | Sidewall | vs 325/40R22 | |
|---|---|---|---|---|---|
| 285/55R20 | 32.3" | 11.2" | 6.2" | +0.3% | |
| 315/50R20 | 32.4" | 12.4" | 6.2" | +0.5% | |
| 305/35R24 | 32.4" | 12.0" | 4.2" | +0.5% | |
| 255/60R20 | 32.0" | 10.0" | 6.0" | −0.6% | |
| 305/50R20 | 32.0" | 12.0" | 6.0" | −0.7% | |
| 265/60R20 | 32.5" | 10.4" | 6.3" | +0.9% |
Actual speed when the speedometer is calibrated for 325/40R22.
| Speedometer shows | on 315/40R22 | on 305/45R22 | on 305/40R22 |
|---|---|---|---|
| 30 mph | 29.7 mph | 30.5 mph | 29.4 mph |
| 45 mph | 44.6 mph | 45.8 mph | 44.1 mph |
| 60 mph | 59.4 mph | 61.1 mph | 58.8 mph |
| 70 mph | 69.3 mph | 71.2 mph | 68.6 mph |
32.2 inches (819 mm). The sidewall is 5.1 inches.
12.8 inches (325 mm) section width, measured sidewall to sidewall.
About 32.2x12.8R22.
315/40R22 is −1.0% in diameter, within the common 3% guideline. It is 0.4" narrower.