179Best 305/45 R20 tires
2 rated tires available in this size, scored on dry, wet, snow, comfort and wear. Top overall right now is the Falken Azenis FK520 at 79/100.
30.8″
overall diameter
12″
section width
20″
rim diameter
654.7
revs per mile
More top-rated 305/45 R20 tires
2179
279Conversion
305/45 R20 in inches
| Overall diameter | 30.8″ |
| Section width | 12″ |
| Rim diameter | 20″ |
| Sidewall height | 137 mm |
| Circumference | 96.8″ |
| Revolutions per mile | 654.7 |
The closest flotation size is 33x12.00R20 — 7.1% taller and 0.1% narrower. Compare them in the calculator.
Wheels
What rims fit 305/45 R20 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 20″ — only the width varies. Estimated from the 12″ section width (70–90% rule).
Fitted from the factory on rims: 20x9, 20x10, 20x11, 20x11.5.
Sidewall
305/45 R20 — 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. |
| 45 | The second number is the aspect ratio: sidewall height as a percentage of width. At 45%, the sidewall is about 137 mm tall. |
| R20 | R means radial construction, which nearly all modern tires use. The number is the rim diameter in inches — this tire fits a 20-inch wheel. |