31.6" tall, 10.4" wide, 6.8" sidewall
A 265/65R18 tire is 31.6 inches (802 mm) tall and 10.4 inches wide. The sidewall is 65% of the width, 6.8 inches, on a 18-inch wheel, and the tire turns about 639 times per mile.
In flotation terms that is about 31.6x10.4R18. People often call it a 32-inch tire.
The size most often compared with it is 275/65R18, which is 0.5" taller (+1.6%). At an indicated 60 mph you would be doing 61.0 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 265/65R18 | |
|---|---|---|---|---|---|
| 245/70R18 | 31.5" | 9.6" | 6.8" | −0.2% | |
| 285/60R18 | 31.5" | 11.2" | 6.7" | −0.3% | |
| 255/70R18 | 32.1" | 10.0" | 7.0" | +1.6% | |
| 275/65R18 | 32.1" | 10.8" | 7.0" | +1.6% | compare |
| 275/60R18 | 31.0" | 10.8" | 6.5" | −1.8% | compare |
| 245/75R18 | 32.5" | 9.6" | 7.2" | +2.9% | |
| 245/65R18 | 30.5" | 9.6" | 6.3" | −3.2% | |
| 285/65R18 | 32.6" | 11.2" | 7.3" | +3.2% | compare |
| 265/70R18 | 32.6" | 10.4" | 7.3" | +3.3% | |
| 285/55R18 | 30.3" | 11.2" | 6.2" | −3.9% |
Sizes within 2% of 31.6" on 20" or 17" or 16" wheels.
| Size | Diameter | Width | Sidewall | vs 265/65R18 | |
|---|---|---|---|---|---|
| 245/60R20 | 31.6" | 9.6" | 5.8" | +0.0% | |
| 285/65R17 | 31.6" | 11.2" | 7.3" | +0.1% | |
| 265/70R17 | 31.6" | 10.4" | 7.3" | +0.1% | |
| 295/50R20 | 31.6" | 11.6" | 5.8" | +0.2% | |
| 265/75R16 | 31.6" | 10.4" | 7.8" | +0.3% | |
| 265/55R20 | 31.5" | 10.4" | 5.7" | −0.3% |
Actual speed when the speedometer is calibrated for 265/65R18.
| Speedometer shows | on 275/65R18 | on 285/65R18 | on 275/60R18 |
|---|---|---|---|
| 30 mph | 30.5 mph | 31.0 mph | 29.5 mph |
| 45 mph | 45.7 mph | 46.5 mph | 44.2 mph |
| 60 mph | 61.0 mph | 61.9 mph | 58.9 mph |
| 70 mph | 71.1 mph | 72.3 mph | 68.7 mph |
31.6 inches (802 mm). The sidewall is 6.8 inches.
10.4 inches (265 mm) section width, measured sidewall to sidewall.
About 31.6x10.4R18.
275/65R18 is +1.6% in diameter, within the common 3% guideline. It is 0.4" wider.