30.5" tall, 11.6" wide, 5.2" sidewall
A 295/45R20 tire is 30.5 inches (774 mm) tall and 11.6 inches wide. The sidewall is 45% of the width, 5.2 inches, on a 20-inch wheel, and the tire turns about 662 times per mile.
In flotation terms that is about 30.5x11.6R20. People often call it a 30-inch tire.
The size most often compared with it is 305/45R20, which is 0.4" taller (+1.2%). At an indicated 60 mph you would be doing 60.7 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 295/45R20 | |
|---|---|---|---|---|---|
| 305/45R20 | 30.8" | 12.0" | 5.4" | +1.2% | |
| 275/50R20 | 30.8" | 10.8" | 5.4" | +1.2% | |
| 315/40R20 | 29.9" | 12.4" | 5.0" | −1.7% | |
| 315/45R20 | 31.2" | 12.4" | 5.6" | +2.3% | |
| 285/50R20 | 31.2" | 11.2" | 5.6" | +2.5% | |
| 305/40R20 | 29.6" | 12.0" | 4.8" | −2.8% | |
| 295/40R20 | 29.3" | 11.6" | 4.6" | −3.8% | |
| 295/50R20 | 31.6" | 11.6" | 5.8" | +3.8% | |
| 275/55R20 | 31.9" | 10.8" | 6.0" | +4.8% | |
| 305/50R20 | 32.0" | 12.0" | 6.0" | +5.1% |
Sizes within 2% of 30.5" on 22" or 18" wheels.
| Size | Diameter | Width | Sidewall | vs 295/45R20 | |
|---|---|---|---|---|---|
| 305/35R22 | 30.4" | 12.0" | 4.2" | −0.2% | |
| 245/65R18 | 30.5" | 9.6" | 6.3" | +0.3% | |
| 285/55R18 | 30.3" | 11.2" | 6.2" | −0.4% | |
| 295/55R18 | 30.8" | 11.6" | 6.4" | +1.1% | |
| 295/35R22 | 30.1" | 11.6" | 4.1" | −1.1% | |
| 325/35R22 | 31.0" | 12.8" | 4.5" | +1.7% |
Actual speed when the speedometer is calibrated for 295/45R20.
| Speedometer shows | on 305/45R20 | on 275/50R20 | on 315/40R20 |
|---|---|---|---|
| 30 mph | 30.3 mph | 30.4 mph | 29.5 mph |
| 45 mph | 45.5 mph | 45.6 mph | 44.2 mph |
| 60 mph | 60.7 mph | 60.7 mph | 59.0 mph |
| 70 mph | 70.8 mph | 70.9 mph | 68.8 mph |
30.5 inches (774 mm). The sidewall is 5.2 inches.
11.6 inches (295 mm) section width, measured sidewall to sidewall.
About 30.5x11.6R20.
305/45R20 is +1.2% in diameter, within the common 3% guideline. It is 0.4" wider.