30.8" tall, 11.6" wide, 6.4" sidewall
A 295/55R18 tire is 30.8 inches (782 mm) tall and 11.6 inches wide. The sidewall is 55% of the width, 6.4 inches, on a 18-inch wheel, and the tire turns about 655 times per mile.
In flotation terms that is about 30.8x11.6R18. People often call it a 31-inch tire.
The size most often compared with it is 275/60R18, which is 0.2" taller (+0.7%). At an indicated 60 mph you would be doing 60.4 mph on it.
| Current | New | Difference |
|---|
| Shows | Actual speed |
|---|
Same 18" wheel, within 20 mm of width and 10 points of aspect ratio.
| Size | Diameter | Width | Sidewall | vs 295/55R18 | |
|---|---|---|---|---|---|
| 275/60R18 | 31.0" | 10.8" | 6.5" | +0.7% | |
| 305/55R18 | 31.2" | 12.0" | 6.6" | +1.4% | |
| 285/55R18 | 30.3" | 11.2" | 6.2" | −1.4% | |
| 285/60R18 | 31.5" | 11.2" | 6.7" | +2.2% | |
| 275/55R18 | 29.9" | 10.8" | 6.0" | −2.8% | |
| 295/60R18 | 31.9" | 11.6" | 7.0" | +3.8% | |
| 275/65R18 | 32.1" | 10.8" | 7.0" | +4.2% | |
| 285/50R18 | 29.2" | 11.2" | 5.6" | −5.1% | |
| 305/60R18 | 32.4" | 12.0" | 7.2" | +5.3% | |
| 285/65R18 | 32.6" | 11.2" | 7.3" | +5.9% |
Sizes within 2% of 30.8" on 20" or 17" or 16" wheels.
| Size | Diameter | Width | Sidewall | vs 295/55R18 | |
|---|---|---|---|---|---|
| 305/45R20 | 30.8" | 12.0" | 5.4" | +0.1% | |
| 275/50R20 | 30.8" | 10.8" | 5.4" | +0.2% | |
| 315/55R17 | 30.6" | 12.4" | 6.8" | −0.4% | |
| 245/55R20 | 30.6" | 9.6" | 5.3" | −0.5% | |
| 265/70R16 | 30.6" | 10.4" | 7.3" | −0.6% | |
| 285/65R16 | 30.6" | 11.2" | 7.3" | −0.6% |
Actual speed when the speedometer is calibrated for 295/55R18.
| Speedometer shows | on 275/60R18 | on 305/55R18 | on 285/55R18 |
|---|---|---|---|
| 30 mph | 30.2 mph | 30.4 mph | 29.6 mph |
| 45 mph | 45.3 mph | 45.6 mph | 44.4 mph |
| 60 mph | 60.4 mph | 60.8 mph | 59.2 mph |
| 70 mph | 70.5 mph | 71.0 mph | 69.0 mph |
30.8 inches (782 mm). The sidewall is 6.4 inches.
11.6 inches (295 mm) section width, measured sidewall to sidewall.
About 30.8x11.6R18.
275/60R18 is +0.7% in diameter, within the common 3% guideline. It is 0.8" narrower.