27.0" tall, 11.6" wide, 3.5" sidewall
A 295/30R20 tire is 27.0 inches (685 mm) tall and 11.6 inches wide. The sidewall is 30% of the width, 3.5 inches, on a 20-inch wheel, and the tire turns about 748 times per mile.
In flotation terms that is about 27.0x11.6R20. People often call it a 27-inch tire.
The size most often compared with it is 305/30R20, which is 0.2" taller (+0.9%). At an indicated 60 mph you would be doing 60.5 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 295/30R20 | |
|---|---|---|---|---|---|
| 305/30R20 | 27.2" | 12.0" | 3.6" | +0.9% | |
| 275/35R20 | 27.6" | 10.8" | 3.8" | +2.3% | |
| 285/35R20 | 27.9" | 11.2" | 3.9" | +3.3% | |
| 295/35R20 | 28.1" | 11.6" | 4.1" | +4.3% | |
| 315/35R20 | 28.7" | 12.4" | 4.3" | +6.4% | |
| 295/40R20 | 29.3" | 11.6" | 4.6" | +8.6% | |
| 305/40R20 | 29.6" | 12.0" | 4.8" | +9.8% | |
| 315/40R20 | 29.9" | 12.4" | 5.0" | +10.9% |
Sizes within 2% of 27.0" on 18" or 19" wheels.
| Size | Diameter | Width | Sidewall | vs 295/30R20 | |
|---|---|---|---|---|---|
| 285/40R18 | 27.0" | 11.2" | 4.5" | +0.0% | |
| 255/45R18 | 27.0" | 10.0" | 4.5" | +0.2% | |
| 285/35R19 | 26.9" | 11.2" | 3.9" | −0.4% | |
| 275/40R18 | 26.7" | 10.8" | 4.3" | −1.1% | |
| 295/40R18 | 27.3" | 11.6" | 4.6" | +1.2% |
Actual speed when the speedometer is calibrated for 295/30R20.
| Speedometer shows | on 305/30R20 | on 275/35R20 | on 285/35R20 |
|---|---|---|---|
| 30 mph | 30.3 mph | 30.7 mph | 31.0 mph |
| 45 mph | 45.4 mph | 46.0 mph | 46.5 mph |
| 60 mph | 60.5 mph | 61.4 mph | 62.0 mph |
| 70 mph | 70.6 mph | 71.6 mph | 72.3 mph |
27.0 inches (685 mm). The sidewall is 3.5 inches.
11.6 inches (295 mm) section width, measured sidewall to sidewall.
About 27.0x11.6R20.
305/30R20 is +0.9% in diameter, within the common 3% guideline. It is 0.4" wider.