235/55 R18 tire dimensions
Nominal geometric dimensions, calculated from the size marking.
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715.7 mm
Overall diameter · 235/55 R18
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What 235/55 R18 means
| Nominal section width | 235 mm |
|---|---|
| Sidewall-to-width ratio | 55% |
| Construction | R — radial |
| Wheel bead-seat diameter | 18 inches |
Load index, speed rating and approved wheel widths must also match the vehicle requirements. Calculated dimensions do not establish a safe replacement size. Actual rolling circumference changes with load, pressure, wear and tire construction.
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