Best 225/65 R18 tires
We don't have rated tires listed in this size yet — the conversion, rim fitment and comparisons below still apply.
29.5″
overall diameter
8.9″
section width
18″
rim diameter
683.3
revs per mile
Conversion
225/65 R18 in inches
| Overall diameter | 29.5″ |
| Section width | 8.9″ |
| Rim diameter | 18″ |
| Sidewall height | 146 mm |
| Circumference | 92.7″ |
| Revolutions per mile | 683.3 |
The closest flotation size is 28x12.00R18 — 5.1% shorter and 35.5% wider. Compare them in the calculator.
Wheels
What rims fit 225/65 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
8″
Rim diameter is fixed at 18″ — only the width varies. Estimated from the 8.9″ section width (70–90% rule).
Fitted from the factory on rims: 18x6.5, 18x7, 18x7.5.
Sidewall
225/65 R18 — what does it mean?
| Parameter | Meaning |
|---|---|
| 225 | The first number is the section width — 225 mm, or about 8.9 inches across the widest part of the tire. |
| 65 | The second number is the aspect ratio: sidewall height as a percentage of width. At 65%, the sidewall is about 146 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. |