193Best 255/45 R20 tires
115 rated tires available in this size, scored on dry, wet, snow, comfort and wear. Top overall right now is the Toyo Extensa HP II at 93/100.
29″
overall diameter
10″
section width
20″
rim diameter
694.6
revs per mile
Best 255/45 R20 summer tires
37193
286
384
484
584
689
789
882
983
1083
1182
128725 more rated tires in this size are listed on their brand pages.
Best 255/45 R20 all-season tires
36
189
289
388
490
586
690
786
884
984
1085
1182
128724 more rated tires in this size are listed on their brand pages.
More top-rated 255/45 R20 tires
30
192
288
388
488
587
693
784
887
983
1084
1183
129318 more rated tires in this size are listed on their brand pages.
Best 255/45 R20 winter tires
11
285
381
479
578
678
777
876
975
1075
1175Best 255/45 R20 all-terrain tires
1
189Conversion
255/45 R20 in inches
| Overall diameter | 29″ |
| Section width | 10″ |
| Rim diameter | 20″ |
| Sidewall height | 115 mm |
| Circumference | 91.2″ |
| Revolutions per mile | 694.6 |
The closest flotation size is 33x11.50R20 — 13.7% taller and 14.5% wider. Compare them in the calculator.
Wheels
What rims fit 255/45 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.
Popular comparisons
Sizes often compared with 255/45 R20
Close alternatives — each opens in the tire size calculator.
Sidewall
255/45 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. |
| 45 | The second number is the aspect ratio: sidewall height as a percentage of width. At 45%, the sidewall is about 115 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. |