27.3" tall, 11.6" wide, 4.6" sidewall
A 295/40R18 tire is 27.3 inches (693 mm) tall and 11.6 inches wide. The sidewall is 40% of the width, 4.6 inches, on a 18-inch wheel, and the tire turns about 739 times per mile.
In flotation terms that is about 27.3x11.6R18. People often call it a 27-inch tire.
The size most often compared with it is 285/40R18, which is 0.3" shorter (−1.2%). At an indicated 60 mph you would be doing 59.3 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 295/40R18 | |
|---|---|---|---|---|---|
| 285/40R18 | 27.0" | 11.2" | 4.5" | −1.2% | |
| 275/45R18 | 27.7" | 10.8" | 4.9" | +1.7% | |
| 275/40R18 | 26.7" | 10.8" | 4.3" | −2.3% | |
| 285/45R18 | 28.1" | 11.2" | 5.0" | +3.0% | |
| 305/35R18 | 26.4" | 12.0" | 4.2" | −3.2% | |
| 295/35R18 | 26.1" | 11.6" | 4.1" | −4.3% | |
| 295/45R18 | 28.5" | 11.6" | 5.2" | +4.3% | |
| 285/35R18 | 25.9" | 11.2" | 3.9" | −5.3% | |
| 275/50R18 | 28.8" | 10.8" | 5.4" | +5.6% | |
| 275/35R18 | 25.6" | 10.8" | 3.8" | −6.3% |
Sizes within 2% of 27.3" on 20" or 17" wheels.
| Size | Diameter | Width | Sidewall | vs 295/40R18 | |
|---|---|---|---|---|---|
| 265/35R20 | 27.3" | 10.4" | 3.7" | +0.0% | |
| 305/30R20 | 27.2" | 12.0" | 3.6" | −0.3% | |
| 265/50R17 | 27.4" | 10.4" | 5.2" | +0.5% | |
| 285/45R17 | 27.1" | 11.2" | 5.0" | −0.7% | |
| 205/65R17 | 27.5" | 8.1" | 5.2" | +0.7% | |
| 255/35R20 | 27.0" | 10.0" | 3.5" | −1.0% |
Actual speed when the speedometer is calibrated for 295/40R18.
| Speedometer shows | on 285/40R18 | on 275/45R18 | on 275/40R18 |
|---|---|---|---|
| 30 mph | 29.7 mph | 30.5 mph | 29.3 mph |
| 45 mph | 44.5 mph | 45.7 mph | 44.0 mph |
| 60 mph | 59.3 mph | 61.0 mph | 58.6 mph |
| 70 mph | 69.2 mph | 71.2 mph | 68.4 mph |
27.3 inches (693 mm). The sidewall is 4.6 inches.
11.6 inches (295 mm) section width, measured sidewall to sidewall.
About 27.3x11.6R18.
285/40R18 is −1.2% in diameter, within the common 3% guideline. It is 0.4" narrower.