33.0" tall, 10.8" wide, 6.5" sidewall
A 275/60R20 tire is 33.0 inches (838 mm) tall and 10.8 inches wide. The sidewall is 60% of the width, 6.5 inches, on a 20-inch wheel, and the tire turns about 611 times per mile.
In flotation terms that is about 33.0x10.8R20, closest to the common 33x12.50R20 (33.0"). People often call it a 33-inch tire.
The size most often compared with it is 275/55R20, which is 1.1" shorter (−3.3%). At an indicated 60 mph you would be doing 58.0 mph on it, more than the 3% change many shops use as a limit.
| 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 275/60R20 | |
|---|---|---|---|---|---|
| 255/65R20 | 33.1" | 10.0" | 6.5" | +0.2% | |
| 295/55R20 | 32.8" | 11.6" | 6.4" | −0.7% | |
| 265/60R20 | 32.5" | 10.4" | 6.3" | −1.4% | compare |
| 285/60R20 | 33.5" | 11.2" | 6.7" | +1.4% | compare |
| 265/65R20 | 33.6" | 10.4" | 6.8" | +1.7% | compare |
| 285/55R20 | 32.3" | 11.2" | 6.2" | −2.0% | compare |
| 295/60R20 | 33.9" | 11.6" | 7.0" | +2.9% | compare |
| 255/60R20 | 32.0" | 10.0" | 6.0" | −2.9% | |
| 275/55R20 | 31.9" | 10.8" | 6.0" | −3.3% | compare |
| 275/65R20 | 34.1" | 10.8" | 7.0" | +3.3% | compare |
Sizes within 2% of 33.0" on 18" or 22" or 19" wheels.
| Size | Diameter | Width | Sidewall | vs 275/60R20 | |
|---|---|---|---|---|---|
| 33x12.50R18 | 33.0" | 12.5" | 7.5" | +0.0% | |
| 33x12.50R22 | 33.0" | 12.5" | 5.5" | +0.0% | |
| 255/70R19 | 33.1" | 10.0" | 7.0" | +0.2% | |
| 255/75R18 | 33.1" | 10.0" | 7.5" | +0.2% | |
| 295/65R18 | 33.1" | 11.6" | 7.5" | +0.3% | |
| 275/70R18 | 33.2" | 10.8" | 7.6" | +0.5% |
Actual speed when the speedometer is calibrated for 275/60R20.
| Speedometer shows | on 275/55R20 | on 275/65R20 | on 285/60R20 |
|---|---|---|---|
| 30 mph | 29.0 mph | 31.0 mph | 30.4 mph |
| 45 mph | 43.5 mph | 46.5 mph | 45.6 mph |
| 60 mph | 58.0 mph | 62.0 mph | 60.9 mph |
| 70 mph | 67.7 mph | 72.3 mph | 71.0 mph |
33.0 inches (838 mm). The sidewall is 6.5 inches.
10.8 inches (275 mm) section width, measured sidewall to sidewall.
About 33.0x10.8R20; the closest common flotation size is 33x12.50R20 at 33.0".
275/55R20 is −3.3% in diameter, more than the common 3% guideline, so expect a speedometer error and check clearance. It is 0.0" wider.