193Best 265/40 R18 tires
28 rated tires available in this size, scored on dry, wet, snow, comfort and wear. Top overall right now is the Michelin Pilot Sport PS2 at 93/100.
26.3″
overall diameter
10.4″
section width
18″
rim diameter
765.5
revs per mile
Best 265/40 R18 summer tires
17193
292
389
483
583
682
779
879
977
1078
1168
12735 more rated tires in this size are listed on their brand pages.
Best 265/40 R18 all-season tires
7
188
286
384
484
580
770More top-rated 265/40 R18 tires
3
188
290
366Best 265/40 R18 winter tires
1
Conversion
265/40 R18 in inches
| Overall diameter | 26.3″ |
| Section width | 10.4″ |
| Rim diameter | 18″ |
| Sidewall height | 106 mm |
| Circumference | 82.8″ |
| Revolutions per mile | 765.5 |
The closest flotation size is 28x12.00R18 — 6.3% taller and 15% wider. Compare them in the calculator.
Wheels
What rims fit 265/40 R18 tires?
A tire fits a range of rim widths. Too narrow or too wide and the sidewall changes shape.
Minimum
7.5″
Ideal
8.5″
Maximum
9.5″
Rim diameter is fixed at 18″ — only the width varies. Estimated from the 10.4″ section width (70–90% rule).
Fitted from the factory on rims: 18x9, 18x9.5, 18x10, 18x10.5.
Popular comparisons
Sizes often compared with 265/40 R18
Close alternatives — each opens in the tire size calculator.
Sidewall
265/40 R18 — what does it mean?
| Parameter | Meaning |
|---|---|
| 265 | The first number is the section width — 265 mm, or about 10.4 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 106 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. |