193Best 315/30 R18 tires
11 rated tires available in this size, scored on dry, wet, snow, comfort and wear. Top overall right now is the Michelin Pilot Sport PS2 at 93/100.
25.4″
overall diameter
12.4″
section width
18″
rim diameter
792.7
revs per mile
Best 315/30 R18 summer tires
8193
283
379
479
574
674
771
866More top-rated 315/30 R18 tires
3
366Conversion
315/30 R18 in inches
| Overall diameter | 25.4″ |
| Section width | 12.4″ |
| Rim diameter | 18″ |
| Sidewall height | 95 mm |
| Circumference | 79.9″ |
| Revolutions per mile | 792.7 |
The closest flotation size is 28x12.00R18 — 10.1% taller and 3.2% narrower. Compare them in the calculator.
Wheels
What rims fit 315/30 R18 tires?
A tire fits a range of rim widths. Too narrow or too wide and the sidewall changes shape.
Minimum
8.5″
Ideal
10″
Maximum
11″
Rim diameter is fixed at 18″ — only the width varies. Estimated from the 12.4″ section width (70–90% rule).
Fitted from the factory on rims: 18x11.
Sidewall
315/30 R18 — what does it mean?
| Parameter | Meaning |
|---|---|
| 315 | The first number is the section width — 315 mm, or about 12.4 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 95 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. |