184Best 305/30 R18 tires
1 rated tire available in this size, scored on dry, wet, snow, comfort and wear. Top overall right now is the Atlas Force UHP at 84/100.
25.2″
overall diameter
12″
section width
18″
rim diameter
800.2
revs per mile
Best 305/30 R18 all-season tires
1184Conversion
305/30 R18 in inches
| Overall diameter | 25.2″ |
| Section width | 12″ |
| Rim diameter | 18″ |
| Sidewall height | 92 mm |
| Circumference | 79.2″ |
| Revolutions per mile | 800.2 |
The closest flotation size is 28x12.00R18 — 11.1% taller and 0.1% narrower. Compare them in the calculator.
Wheels
What rims fit 305/30 R18 tires?
A tire fits a range of rim widths. Too narrow or too wide and the sidewall changes shape.
Minimum
8.5″
Ideal
9.5″
Maximum
11″
Rim diameter is fixed at 18″ — only the width varies. Estimated from the 12″ section width (70–90% rule).
Fitted from the factory on rims: 18x11.
Sidewall
305/30 R18 — what does it mean?
| Parameter | Meaning |
|---|---|
| 305 | The first number is the section width — 305 mm, or about 12 inches across the widest part of the tire. |
| 30 | The second number is the aspect ratio: sidewall height as a percentage of width. At 30%, the sidewall is about 92 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. |