235/60R18 means a 235 mm section width, a 60% aspect ratio, radial construction and a 18-inch wheel. That works out to a 141 mm sidewall and an overall diameter of about 739.2 mm.
The aspect ratio is a proportion, not a measurement: the same 45 gives a different sidewall height on a different width, and that changes both ride and handling. A lower ratio holds a corner better and transmits more of the road surface.
Mid and full-size SUVs, including lower trims of the Palisade and Sorento.
What each number means
| 235 | Section width 235 mm |
|---|---|
| 60 | Aspect ratio 141 mm (60% × 235 mm) |
| R | Construction Radial |
| 18 | Wheel diameter 457.2 mm |
| Overall diameter | 739.2 mm 29.1" |
Compatible alternatives
| Size | Overall diameter | Diameter difference |
|---|---|---|
| 235/55R19 | 741.1 mm | +0.3% |
| 245/60R18 | 751.2 mm | +1.6% |
| 255/60R18 | 763.2 mm | +3.2% |
Load index and speed rating
After the size itself, a tyre wall carries something like 91V. The number is the load index — the weight one tyre can carry, 91 meaning 615 kg — and the letter is the speed rating, V meaning 240 km/h.
Never drop below the load index the manufacturer specified, even if the size matches. The original specification is printed on the label inside the driver’s door.