31.6" tall, 9.6" wide, 5.8" sidewall
A 245/60R20 tire is 31.6 inches (802 mm) tall and 9.6 inches wide. The sidewall is 60% of the width, 5.8 inches, on a 20-inch wheel, and the tire turns about 639 times per mile.
In flotation terms that is about 31.6x9.6R20. People often call it a 32-inch tire.
The size most often compared with it is 275/55R20, which is 0.3" taller (+1.1%). At an indicated 60 mph you would be doing 60.6 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 245/60R20 | |
|---|---|---|---|---|---|
| 265/55R20 | 31.5" | 10.4" | 5.7" | −0.3% | |
| 255/60R20 | 32.0" | 10.0" | 6.0" | +1.5% | |
| 265/60R20 | 32.5" | 10.4" | 6.3" | +3.0% | compare |
| 245/55R20 | 30.6" | 9.6" | 5.3" | −3.1% | |
| 255/65R20 | 33.1" | 10.0" | 6.5" | +4.7% | |
| 265/65R20 | 33.6" | 10.4" | 6.8" | +6.3% | |
| 265/70R20 | 34.6" | 10.4" | 7.3" | +9.6% |
Sizes within 2% of 31.6" on 18" or 22" or 19" wheels.
| Size | Diameter | Width | Sidewall | vs 245/60R20 | |
|---|---|---|---|---|---|
| 265/65R18 | 31.6" | 10.4" | 6.8" | −0.0% | |
| 305/40R22 | 31.6" | 12.0" | 4.8" | +0.1% | |
| 245/70R18 | 31.5" | 9.6" | 6.8" | −0.2% | |
| 285/60R18 | 31.5" | 11.2" | 6.7" | −0.3% | |
| 275/45R22 | 31.7" | 10.8" | 4.9" | +0.5% | |
| 225/70R19 | 31.4" | 8.9" | 6.2" | −0.5% |
Actual speed when the speedometer is calibrated for 245/60R20.
| Speedometer shows | on 275/55R20 | on 265/60R20 | on 265/55R20 |
|---|---|---|---|
| 30 mph | 30.3 mph | 30.9 mph | 29.9 mph |
| 45 mph | 45.5 mph | 46.3 mph | 44.9 mph |
| 60 mph | 60.6 mph | 61.8 mph | 59.8 mph |
| 70 mph | 70.7 mph | 72.1 mph | 69.8 mph |
31.6 inches (802 mm). The sidewall is 5.8 inches.
9.6 inches (245 mm) section width, measured sidewall to sidewall.
About 31.6x9.6R20.
275/55R20 is +1.1% in diameter, within the common 3% guideline. It is 1.2" wider.