36.1" tall, 12.8" wide, 7.0" sidewall
A 325/55R22 tire is 36.1 inches (916 mm) tall and 12.8 inches wide. The sidewall is 55% of the width, 7.0 inches, on a 22-inch wheel, and the tire turns about 559 times per mile.
In flotation terms that is about 36.1x12.8R22. People often call it a 36-inch tire.
The size most often compared with it is 305/55R22, which is 0.9" shorter (−2.4%). At an indicated 60 mph you would be doing 58.6 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 325/55R22 | |
|---|---|---|---|---|---|
| 305/55R22 | 35.2" | 12.0" | 6.6" | −2.4% | |
| 37x12.50R22 | 37.0" | 12.5" | 7.5" | +2.6% | |
| 37x13.50R22 | 37.0" | 13.5" | 7.5" | +2.6% | |
| 35x12.50R22 | 35.0" | 12.5" | 6.5" | −3.0% | |
| 325/50R22 | 34.8" | 12.8" | 6.4" | −3.5% | |
| 315/50R22 | 34.4" | 12.4" | 6.2" | −4.6% | |
| 305/50R22 | 34.0" | 12.0" | 6.0" | −5.7% | |
| 325/45R22 | 33.5" | 12.8" | 5.8" | −7.1% | |
| 315/45R22 | 33.2" | 12.4" | 5.6" | −8.1% | |
| 305/45R22 | 32.8" | 12.0" | 5.4" | −9.1% |
Sizes within 2% of 36.1" on 20" or 24" wheels.
| Size | Diameter | Width | Sidewall | vs 325/55R22 | |
|---|---|---|---|---|---|
| 315/65R20 | 36.1" | 12.4" | 8.1" | +0.1% | |
| 275/75R20 | 36.2" | 10.8" | 8.1" | +0.5% | |
| 295/70R20 | 36.3" | 11.6" | 8.1" | +0.5% | |
| 315/50R24 | 36.4" | 12.4" | 6.2" | +0.9% | |
| 285/70R20 | 35.7" | 11.2" | 7.9" | −1.0% | |
| 265/75R20 | 35.6" | 10.4" | 7.8" | −1.2% |
Actual speed when the speedometer is calibrated for 325/55R22.
| Speedometer shows | on 305/55R22 | on 37x12.50R22 | on 37x13.50R22 |
|---|---|---|---|
| 30 mph | 29.3 mph | 30.8 mph | 30.8 mph |
| 45 mph | 43.9 mph | 46.2 mph | 46.2 mph |
| 60 mph | 58.6 mph | 61.5 mph | 61.5 mph |
| 70 mph | 68.3 mph | 71.8 mph | 71.8 mph |
36.1 inches (916 mm). The sidewall is 7.0 inches.
12.8 inches (325 mm) section width, measured sidewall to sidewall.
About 36.1x12.8R22.
305/55R22 is −2.4% in diameter, within the common 3% guideline. It is 0.8" narrower.