Best 215/85 R18 tires
We don't have rated tires listed in this size yet — the conversion, rim fitment and comparisons below still apply.
32.4″
overall diameter
8.5″
section width
18″
rim diameter
622.7
revs per mile
Conversion
215/85 R18 in inches
| Overall diameter | 32.4″ |
| Section width | 8.5″ |
| Rim diameter | 18″ |
| Sidewall height | 183 mm |
| Circumference | 101.8″ |
| Revolutions per mile | 622.7 |
The closest flotation size is 33x10.50R18 — 1.9% taller and 24% wider. Compare them in the calculator.
Wheels
What rims fit 215/85 R18 tires?
A tire fits a range of rim widths. Too narrow or too wide and the sidewall changes shape.
Minimum
6″
Ideal
7″
Maximum
7.5″
Rim diameter is fixed at 18″ — only the width varies. Estimated from the 8.5″ section width (70–90% rule).
Fitted from the factory on rims: 18x6.
Sidewall
215/85 R18 — what does it mean?
| Parameter | Meaning |
|---|---|
| 215 | The first number is the section width — 215 mm, or about 8.5 inches across the widest part of the tire. |
| 85 | The second number is the aspect ratio: sidewall height as a percentage of width. At 85%, the sidewall is about 183 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. |