Best 205/55 R18 tires
We don't have rated tires listed in this size yet — the conversion, rim fitment and comparisons below still apply.
26.9″
overall diameter
8.1″
section width
18″
rim diameter
750.4
revs per mile
Conversion
205/55 R18 in inches
| Overall diameter | 26.9″ |
| Section width | 8.1″ |
| Rim diameter | 18″ |
| Sidewall height | 113 mm |
| Circumference | 84.4″ |
| Revolutions per mile | 750.4 |
The closest flotation size is 28x12.00R18 — 4.2% taller and 48.7% wider. Compare them in the calculator.
Wheels
What rims fit 205/55 R18 tires?
A tire fits a range of rim widths. Too narrow or too wide and the sidewall changes shape.
Minimum
5.5″
Ideal
6.5″
Maximum
7.5″
Rim diameter is fixed at 18″ — only the width varies. Estimated from the 8.1″ section width (70–90% rule).
Fitted from the factory on rims: 18x6.5, 18x7.
Sidewall
205/55 R18 — what does it mean?
| Parameter | Meaning |
|---|---|
| 205 | The first number is the section width — 205 mm, or about 8.1 inches across the widest part of the tire. |
| 55 | The second number is the aspect ratio: sidewall height as a percentage of width. At 55%, the sidewall is about 113 mm tall. |
| R18 | R means radial construction, which nearly all modern tires use. The number is the rim diameter in inches — this tire fits a 18-inch wheel. |