Best 245/55 R20 tires
We don't have rated tires listed in this size yet — the conversion, rim fitment and comparisons below still apply.
30.6″
overall diameter
9.6″
section width
20″
rim diameter
658.9
revs per mile
Conversion
245/55 R20 in inches
| Overall diameter | 30.6″ |
| Section width | 9.6″ |
| Rim diameter | 20″ |
| Sidewall height | 135 mm |
| Circumference | 96.2″ |
| Revolutions per mile | 658.9 |
The closest flotation size is 33x11.50R20 — 7.8% taller and 19.2% wider. Compare them in the calculator.
Wheels
What rims fit 245/55 R20 tires?
A tire fits a range of rim widths. Too narrow or too wide and the sidewall changes shape.
Minimum
7″
Ideal
7.5″
Maximum
8.5″
Rim diameter is fixed at 20″ — only the width varies. Estimated from the 9.6″ section width (70–90% rule).
Fitted from the factory on rims: 20x7.5.
Sidewall
245/55 R20 — what does it mean?
| Parameter | Meaning |
|---|---|
| 245 | The first number is the section width — 245 mm, or about 9.6 inches across the widest part of the tire. |
| 55 | The second number is the aspect ratio: sidewall height as a percentage of width. At 55%, the sidewall is about 135 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. |