255/70R18 in inches
A 255/70R18 tire stands 32.1 inches tall and is 10.0 inches wide. It fits an 18-inch wheel. People usually call it a 32-inch tire.
Tall
32.1″
814 mm
Wide
10.0″
255 mm
Wheel
18″
rim diameter
Cars that come with 255/70R18
Similar-height sizes
Within 3% of 255/70R18, so your speedometer stays close.
| Size | Height | vs 255/70R18 | |
|---|---|---|---|
| 255/75R17 | 32.1″ | +0.0%needs 17″ wheels | Compare |
| 255/60R20 | 32.0″ | −0.0%needs 20″ wheels | Compare |
| 275/65R18 | 32.1″ | +0.1% | Compare |
| 285/45R22 | 32.1″ | +0.1%needs 22″ wheels | Compare |
| 275/55R20 | 31.9″ | −0.5%needs 20″ wheels | Compare |
| 275/45R22 | 31.7″ | −1.0%needs 22″ wheels | Compare |
| 265/50R22 | 32.4″ | +1.2%needs 22″ wheels | Compare |
| 265/75R16 | 31.6″ | −1.3%needs 16″ wheels | Compare |
How 255/70R18 is measured
| Measurement | Inches | Millimetres |
|---|---|---|
| Overall height (diameter) | 32.06 | 814 |
| Tread width | 10.04 | 255 |
| Sidewall height | 7.03 | 179 |
| Distance per turn (circumference) | 100.7 | 2558 |
| Turns per mile | 629 | |
The first number (255) is the width in millimetres. The second (70) means the sidewall is 70% as tall as the tire is wide. The last (18) is the wheel size in inches. More on reading a tire size.