178Best 285/45 R18 tires
1 rated tire available in this size, scored on dry, wet, snow, comfort and wear. Top overall right now is the Pirelli P Zero System at 78/100.
28.1″
overall diameter
11.2″
section width
18″
rim diameter
717.8
revs per mile
Best 285/45 R18 summer tires
1178Conversion
285/45 R18 in inches
| Overall diameter | 28.1″ |
| Section width | 11.2″ |
| Rim diameter | 18″ |
| Sidewall height | 128 mm |
| Circumference | 88.3″ |
| Revolutions per mile | 717.8 |
The closest flotation size is 28x12.00R18 — 0.4% shorter and 6.9% wider. Compare them in the calculator.
Wheels
What rims fit 285/45 R18 tires?
A tire fits a range of rim widths. Too narrow or too wide and the sidewall changes shape.
Minimum
8″
Ideal
9″
Maximum
10″
Rim diameter is fixed at 18″ — only the width varies. Estimated from the 11.2″ section width (70–90% rule).
Fitted from the factory on rims: 18x8, 18x9, 18x9.5.
Popular comparisons
Sizes often compared with 285/45 R18
Close alternatives — each opens in the tire size calculator.
Sidewall
285/45 R18 — what does it mean?
| Parameter | Meaning |
|---|---|
| 285 | The first number is the section width — 285 mm, or about 11.2 inches across the widest part of the tire. |
| 45 | The second number is the aspect ratio: sidewall height as a percentage of width. At 45%, the sidewall is about 128 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. |