35.4" tall, 12.8" wide, 7.7" sidewall
A 325/60R20 tire is 35.4 inches (898 mm) tall and 12.8 inches wide. The sidewall is 60% of the width, 7.7 inches, on a 20-inch wheel, and the tire turns about 570 times per mile.
In flotation terms that is about 35.4x12.8R20, closest to the common 35x11.50R20 (35.0"). People often call it a 35-inch tire.
The size most often compared with it is 35x12.50R20, which is 0.4" shorter (−1.0%). At an indicated 60 mph you would be doing 59.4 mph on it.
| Current | New | Difference |
|---|
| Shows | Actual speed |
|---|
Same 20" wheel, within 20 mm of width and 10 points of aspect ratio.
| Size | Diameter | Width | Sidewall | vs 325/60R20 | |
|---|---|---|---|---|---|
| 305/65R20 | 35.6" | 12.0" | 7.8" | +0.7% | |
| 35x12.50R20 | 35.0" | 12.5" | 7.5" | −1.0% | compare |
| 35x13.50R20 | 35.0" | 13.5" | 7.5" | −1.0% | |
| 315/60R20 | 34.9" | 12.4" | 7.4" | −1.3% | |
| 315/65R20 | 36.1" | 12.4" | 8.1" | +2.2% | |
| 305/60R20 | 34.4" | 12.0" | 7.2" | −2.7% | |
| 325/55R20 | 34.1" | 12.8" | 7.0" | −3.6% | |
| 37x12.50R20 | 37.0" | 12.5" | 8.5" | +4.7% | |
| 37x13.50R20 | 37.0" | 13.5" | 8.5" | +4.7% | |
| 315/55R20 | 33.6" | 12.4" | 6.8" | −4.8% |
Sizes within 2% of 35.4" on 18" or 22" wheels.
| Size | Diameter | Width | Sidewall | vs 325/60R20 | |
|---|---|---|---|---|---|
| 315/70R18 | 35.4" | 12.4" | 8.7" | +0.0% | |
| 275/80R18 | 35.3" | 10.8" | 8.7" | −0.1% | |
| 295/75R18 | 35.4" | 11.6" | 8.7" | +0.2% | |
| 285/60R22 | 35.5" | 11.2" | 6.7" | +0.3% | |
| 305/55R22 | 35.2" | 12.0" | 6.6" | −0.4% | |
| 245/70R22 | 35.5" | 9.6" | 6.8" | +0.4% |
Actual speed when the speedometer is calibrated for 325/60R20.
| Speedometer shows | on 35x12.50R20 | on 305/65R20 | on 35x13.50R20 |
|---|---|---|---|
| 30 mph | 29.7 mph | 30.2 mph | 29.7 mph |
| 45 mph | 44.5 mph | 45.3 mph | 44.5 mph |
| 60 mph | 59.4 mph | 60.4 mph | 59.4 mph |
| 70 mph | 69.3 mph | 70.5 mph | 69.3 mph |
35.4 inches (898 mm). The sidewall is 7.7 inches.
12.8 inches (325 mm) section width, measured sidewall to sidewall.
About 35.4x12.8R20; the closest common flotation size is 35x11.50R20 at 35.0".
35x12.50R20 is −1.0% in diameter, within the common 3% guideline. It is 0.3" narrower.