173Best 225/40 R20 tires
2 rated tires available in this size, scored on dry, wet, snow, comfort and wear. Top overall right now is the Pirelli P Zero PZ4 Run Flat at 73/100.
27.1″
overall diameter
8.9″
section width
20″
rim diameter
744.6
revs per mile
Best 225/40 R20 summer tires
2
Conversion
225/40 R20 in inches
| Overall diameter | 27.1″ |
| Section width | 8.9″ |
| Rim diameter | 20″ |
| Sidewall height | 90 mm |
| Circumference | 85.1″ |
| Revolutions per mile | 744.6 |
The closest flotation size is 33x11.50R20 — 21.8% taller and 29.8% wider. Compare them in the calculator.
Wheels
What rims fit 225/40 R20 tires?
A tire fits a range of rim widths. Too narrow or too wide and the sidewall changes shape.
Minimum
6″
Ideal
7″
Maximum
8″
Rim diameter is fixed at 20″ — only the width varies. Estimated from the 8.9″ section width (70–90% rule).
Fitted from the factory on rims: 20x7.5, 20x8, 20x8.5, 20x9.
Popular comparisons
Sizes often compared with 225/40 R20
Close alternatives — each opens in the tire size calculator.
Sidewall
225/40 R20 — what does it mean?
| Parameter | Meaning |
|---|---|
| 225 | The first number is the section width — 225 mm, or about 8.9 inches across the widest part of the tire. |
| 40 | The second number is the aspect ratio: sidewall height as a percentage of width. At 40%, the sidewall is about 90 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. |