Tire sizes / 255/40R18
255/40R18 Tire Size
255/40R18
- 255: tread width of 255 mm (10 in)
- 40: sidewall height is 40% of the width, about 102 mm
- R: radial construction
- 18: fits a 18-inch wheel
Dimensions
| Overall diameter | 26 in (661 mm) |
|---|---|
| Section width | 10 in (255 mm) |
| Sidewall height | 4.0 in (102 mm) |
| Wheel diameter | 18 in |
| Revolutions per mile | about 775 |
Nominal figures calculated from the size code. Real tires vary a little by brand and tread depth.
Cars that came with 255/40R18 tires
| Vehicle | Years |
|---|---|
| Lexus IS | |
| Lexus IS C | |
| Toyota GR Supra |
Factory fitment only, from owner's manuals. Many other cars can run this size; check with a tire shop before changing size.