179Best 235/40 R20 tires
5 rated tires available in this size, scored on dry, wet, snow, comfort and wear. Top overall right now is the Michelin Pilot Sport All Season 4 at 88/100.
27.4″
overall diameter
9.3″
section width
20″
rim diameter
736
revs per mile
Best 235/40 R20 summer tires
3179
279
377Best 235/40 R20 all-season tires
1
188More top-rated 235/40 R20 tires
1
184Conversion
235/40 R20 in inches
| Overall diameter | 27.4″ |
| Section width | 9.3″ |
| Rim diameter | 20″ |
| Sidewall height | 94 mm |
| Circumference | 86.1″ |
| Revolutions per mile | 736 |
The closest flotation size is 33x11.50R20 — 20.4% taller and 24.3% wider. Compare them in the calculator.
Wheels
What rims fit 235/40 R20 tires?
A tire fits a range of rim widths. Too narrow or too wide and the sidewall changes shape.
Minimum
6.5″
Ideal
7.5″
Maximum
8.5″
Rim diameter is fixed at 20″ — only the width varies. Estimated from the 9.3″ section width (70–90% rule).
Fitted from the factory on rims: 20x8, 20x8.5, 20x9.5, 20x11.5.
Popular comparisons
Sizes often compared with 235/40 R20
Close alternatives — each opens in the tire size calculator.
Sidewall
235/40 R20 — what does it mean?
| Parameter | Meaning |
|---|---|
| 235 | The first number is the section width — 235 mm, or about 9.3 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 94 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. |