245/40R18 in inches
A 245/40R18 tire stands 25.7 inches tall and is 9.6 inches wide. It fits an 18-inch wheel.
Tall
25.7″
653 mm
Wide
9.6″
245 mm
Wheel
18″
rim diameter
Cars that come with 245/40R18
Similar-height sizes
Within 3% of 245/40R18, so your speedometer stays close.
| Size | Height | vs 245/40R18 | |
|---|---|---|---|
| 245/35R19 | 25.8″ | +0.1%needs 19″ wheels | Compare |
| 245/30R20 | 25.8″ | +0.3%needs 20″ wheels | Compare |
| 225/50R17 | 25.9″ | +0.6%needs 17″ wheels | Compare |
| 215/50R17 | 25.5″ | −1.0%needs 17″ wheels | Compare |
| 235/40R18 | 25.4″ | −1.2% | Compare |
| 215/55R16 | 25.3″ | −1.6%needs 16″ wheels | Compare |
| 215/60R16 | 26.2″ | +1.7%needs 16″ wheels | Compare |
| 265/30R19 | 25.3″ | −1.8%needs 19″ wheels | Compare |
How 245/40R18 is measured
| Measurement | Inches | Millimetres |
|---|---|---|
| Overall height (diameter) | 25.72 | 653 |
| Tread width | 9.65 | 245 |
| Sidewall height | 3.86 | 98 |
| Distance per turn (circumference) | 80.8 | 2052 |
| Turns per mile | 784 | |
The first number (245) is the width in millimetres. The second (40) means the sidewall is 40% as tall as the tire is wide. The last (18) is the wheel size in inches. More on reading a tire size.