192Best 305/70 R18 tires
12 rated tires available in this size, scored on dry, wet, snow, comfort and wear. Top overall right now is the Toyo Open Country A/T III EV at 92/100.
34.8″
overall diameter
12″
section width
18″
rim diameter
579.4
revs per mile
Best 305/70 R18 all-terrain tires
8192
288
388
487
586
691
791
892Best 305/70 R18 mud-terrain tires
3
190
365More top-rated 305/70 R18 tires
1
188Conversion
305/70 R18 in inches
| Overall diameter | 34.8″ |
| Section width | 12″ |
| Rim diameter | 18″ |
| Sidewall height | 214 mm |
| Circumference | 109.4″ |
| Revolutions per mile | 579.4 |
The closest flotation size is 35x12.50R18 — 0.5% taller and 4.1% wider. Compare them in the calculator.
Wheels
What rims fit 305/70 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: 18x9.
Popular comparisons
Sizes often compared with 305/70 R18
Close alternatives — each opens in the tire size calculator.
Sidewall
305/70 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. |
| 70 | The second number is the aspect ratio: sidewall height as a percentage of width. At 70%, the sidewall is about 214 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. |