30.5" tall, 10.8" wide, 3.2" sidewall
A 275/30R24 tire is 30.5 inches (775 mm) tall and 10.8 inches wide. The sidewall is 30% of the width, 3.2 inches, on a 24-inch wheel, and the tire turns about 661 times per mile.
In flotation terms that is about 30.5x10.8R24. People often call it a 30-inch tire.
The size most often compared with it is 295/30R24, which is 0.5" taller (+1.5%). At an indicated 60 mph you would be doing 60.9 mph on it.
| Current | New | Difference |
|---|
| Shows | Actual speed |
|---|
Same 24" wheel, within 20 mm of width and 10 points of aspect ratio.
| Size | Diameter | Width | Sidewall | vs 275/30R24 | |
|---|---|---|---|---|---|
| 295/30R24 | 31.0" | 11.6" | 3.5" | +1.5% | |
| 275/35R24 | 31.6" | 10.8" | 3.8" | +3.6% | |
| 285/35R24 | 31.9" | 11.2" | 3.9" | +4.5% | |
| 285/40R24 | 33.0" | 11.2" | 4.5" | +8.1% | |
| 295/40R24 | 33.3" | 11.6" | 4.6" | +9.2% |
Sizes within 2% of 30.5" on 22" wheels.
| Size | Diameter | Width | Sidewall | vs 275/30R24 | |
|---|---|---|---|---|---|
| 305/35R22 | 30.4" | 12.0" | 4.2" | −0.3% | |
| 295/35R22 | 30.1" | 11.6" | 4.1" | −1.2% | |
| 325/35R22 | 31.0" | 12.8" | 4.5" | +1.5% | |
| 285/40R22 | 31.0" | 11.2" | 4.5" | +1.6% |
Actual speed when the speedometer is calibrated for 275/30R24.
| Speedometer shows | on 295/30R24 | on 275/35R24 | on 285/35R24 |
|---|---|---|---|
| 30 mph | 30.5 mph | 31.1 mph | 31.3 mph |
| 45 mph | 45.7 mph | 46.6 mph | 47.0 mph |
| 60 mph | 60.9 mph | 62.1 mph | 62.7 mph |
| 70 mph | 71.1 mph | 72.5 mph | 73.1 mph |
30.5 inches (775 mm). The sidewall is 3.2 inches.
10.8 inches (275 mm) section width, measured sidewall to sidewall.
About 30.5x10.8R24.
295/30R24 is +1.5% in diameter, within the common 3% guideline. It is 0.8" wider.