255/40R20 in inches
A 255/40R20 tire stands 28.0 inches tall and is 10.0 inches wide. It fits a 20-inch wheel.
Tall
28.0″
712 mm
Wide
10.0″
255 mm
Wheel
20″
rim diameter
Cars that come with 255/40R20
Similar-height sizes
Within 3% of 255/40R20, so your speedometer stays close.
| Size | Height | vs 255/40R20 | |
|---|---|---|---|
| 255/45R19 | 28.0″ | +0.0%needs 19″ wheels | Compare |
| 255/35R21 | 28.0″ | −0.0%needs 21″ wheels | Compare |
| 235/60R17 | 28.1″ | +0.3%needs 17″ wheels | Compare |
| 235/55R18 | 28.2″ | +0.5%needs 18″ wheels | Compare |
| 235/50R19 | 28.3″ | +0.8%needs 19″ wheels | Compare |
| 225/55R18 | 27.7″ | −1.0%needs 18″ wheels | Compare |
| 245/45R19 | 27.7″ | −1.2%needs 19″ wheels | Compare |
| 225/60R17 | 27.6″ | −1.4%needs 17″ wheels | Compare |
How 255/40R20 is measured
| Measurement | Inches | Millimetres |
|---|---|---|
| Overall height (diameter) | 28.03 | 712 |
| Tread width | 10.04 | 255 |
| Sidewall height | 4.02 | 102 |
| Distance per turn (circumference) | 88.1 | 2237 |
| Turns per mile | 719 | |
The first number (255) is the width in millimetres. The second (40) means the sidewall is 40% as tall as the tire is wide. The last (20) is the wheel size in inches. More on reading a tire size.