192Best 255/40 R20 tires
77 rated tires available in this size, scored on dry, wet, snow, comfort and wear. Top overall right now is the Michelin Pilot Super Sport at 92/100.
28″
overall diameter
10″
section width
20″
rim diameter
719.5
revs per mile
Best 255/40 R20 summer tires
34192
289
389
483
589
683
783
887
980
1080
1179
127922 more rated tires in this size are listed on their brand pages.
More top-rated 255/40 R20 tires
24
192
288
388
490
593
684
784
886
985
1080
1179
127912 more rated tires in this size are listed on their brand pages.
Best 255/40 R20 all-season tires
12
188
286
384
485
587
684
780
877
1169
1263Best 255/40 R20 winter tires
7
183
280
380
486
675
773Conversion
255/40 R20 in inches
| Overall diameter | 28″ |
| Section width | 10″ |
| Rim diameter | 20″ |
| Sidewall height | 102 mm |
| Circumference | 88.1″ |
| Revolutions per mile | 719.5 |
The closest flotation size is 33x11.50R20 — 17.7% taller and 14.5% wider. Compare them in the calculator.
Wheels
What rims fit 255/40 R20 tires?
A tire fits a range of rim widths. Too narrow or too wide and the sidewall changes shape.
Minimum
7″
Ideal
8″
Maximum
9″
Rim diameter is fixed at 20″ — only the width varies. Estimated from the 10″ section width (70–90% rule).
Fitted from the factory on rims: 20x8, 20x8.5, 20x9, 20x9.5, 20x10, 20x10.5, 20x11, 20x11.5.
Popular comparisons
Sizes often compared with 255/40 R20
Close alternatives — each opens in the tire size calculator.
Sidewall
255/40 R20 — what does it mean?
| Parameter | Meaning |
|---|---|
| 255 | The first number is the section width — 255 mm, or about 10 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 102 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. |