255/45R20 in inches
A 255/45R20 tire stands 29.0 inches tall and is 10.0 inches wide. It fits a 20-inch wheel.
Tall
29.0″
737 mm
Wide
10.0″
255 mm
Wheel
20″
rim diameter
Cars that come with 255/45R20
Similar-height sizes
Within 3% of 255/45R20, so your speedometer stays close.
| Size | Height | vs 255/45R20 | |
|---|---|---|---|
| 235/65R17 | 29.0″ | −0.0%needs 17″ wheels | Compare |
| 235/60R18 | 29.1″ | +0.2%needs 18″ wheels | Compare |
| 235/55R19 | 29.2″ | +0.5%needs 19″ wheels | Compare |
| 235/50R20 | 29.3″ | +0.7% | Compare |
| 225/75R16 | 29.3″ | +0.9%needs 16″ wheels | Compare |
| 225/55R19 | 28.7″ | −1.0%needs 19″ wheels | Compare |
| 225/60R18 | 28.6″ | −1.4%needs 18″ wheels | Compare |
| 275/35R21 | 28.6″ | −1.6%needs 21″ wheels | Compare |
How 255/45R20 is measured
| Measurement | Inches | Millimetres |
|---|---|---|
| Overall height (diameter) | 29.04 | 737 |
| Tread width | 10.04 | 255 |
| Sidewall height | 4.52 | 115 |
| Distance per turn (circumference) | 91.2 | 2317 |
| Turns per mile | 695 | |
The first number (255) is the width in millimetres. The second (45) means the sidewall is 45% as tall as the tire is wide. The last (20) is the wheel size in inches. More on reading a tire size.