193Best 255/45 R18 tires
63 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.
27″
overall diameter
10″
section width
18″
rim diameter
746
revs per mile
Best 255/45 R18 summer tires
36193
289
384
484
582
682
782
882
989
1086
1181
127924 more rated tires in this size are listed on their brand pages.
Best 255/45 R18 all-season tires
15
188
286
386
484
584
685
782
887
978
1077
1175
12753 more rated tires in this size are listed on their brand pages.
More top-rated 255/45 R18 tires
6
184
283
383
483
593
658Best 255/45 R18 winter tires
6
180
276
376
475
575
Conversion
255/45 R18 in inches
| Overall diameter | 27″ |
| Section width | 10″ |
| Rim diameter | 18″ |
| Sidewall height | 115 mm |
| Circumference | 84.9″ |
| Revolutions per mile | 746 |
The closest flotation size is 28x12.00R18 — 3.6% taller and 19.5% wider. Compare them in the calculator.
Wheels
What rims fit 255/45 R18 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 18″ — only the width varies. Estimated from the 10″ section width (70–90% rule).
Fitted from the factory on rims: 18x7, 18x7.5, 18x8, 18x8.5, 18x9, 18x9.5.
Popular comparisons
Sizes often compared with 255/45 R18
Close alternatives — each opens in the tire size calculator.
Sidewall
255/45 R18 — 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. |
| R18 | R means radial construction, which nearly all modern tires use. The number is the rim diameter in inches — this tire fits a 18-inch wheel. |