255/65R18 in inches
A 255/65R18 tire stands 31.1 inches tall and is 10.0 inches wide. It fits an 18-inch wheel. People usually call it a 31-inch tire.
Tall
31.1″
789 mm
Wide
10.0″
255 mm
Wheel
18″
rim diameter
Cars that come with 255/65R18
Similar-height sizes
Within 3% of 255/65R18, so your speedometer stays close.
| Size | Height | vs 255/65R18 | |
|---|---|---|---|
| 255/70R17 | 31.1″ | +0.0%needs 17″ wheels | Compare |
| 255/55R20 | 31.0″ | −0.0%needs 20″ wheels | Compare |
| 275/45R21 | 30.7″ | −1.0%needs 21″ wheels | Compare |
| 245/75R17 | 31.5″ | +1.3%needs 17″ wheels | Compare |
| 265/55R20 | 31.5″ | +1.4%needs 20″ wheels | Compare |
| 265/70R16 | 30.6″ | −1.4%needs 16″ wheels | Compare |
| 265/65R17 | 30.6″ | −1.6%needs 17″ wheels | Compare |
| 265/65R18 | 31.6″ | +1.6% | Compare |
How 255/65R18 is measured
| Measurement | Inches | Millimetres |
|---|---|---|
| Overall height (diameter) | 31.05 | 789 |
| Tread width | 10.04 | 255 |
| Sidewall height | 6.53 | 166 |
| Distance per turn (circumference) | 97.6 | 2478 |
| Turns per mile | 650 | |
The first number (255) is the width in millimetres. The second (65) means the sidewall is 65% as tall as the tire is wide. The last (18) is the wheel size in inches. More on reading a tire size.