192Best 275/40 R18 tires
58 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.
26.7″
overall diameter
10.8″
section width
18″
rim diameter
756.5
revs per mile
Best 275/40 R18 summer tires
35192
293
389
484
584
683
782
882
983
1082
1181
128123 more rated tires in this size are listed on their brand pages.
More top-rated 275/40 R18 tires
12
193
288
390
483
583
683
782
886
980
1079
1266Best 275/40 R18 all-season tires
10
188
286
386
485
584
684
782
884
1070Best 275/40 R18 winter tires
1
180Conversion
275/40 R18 in inches
| Overall diameter | 26.7″ |
| Section width | 10.8″ |
| Rim diameter | 18″ |
| Sidewall height | 110 mm |
| Circumference | 83.8″ |
| Revolutions per mile | 756.5 |
The closest flotation size is 28x12.00R18 — 5% taller and 10.8% wider. Compare them in the calculator.
Wheels
What rims fit 275/40 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 10.8″ section width (70–90% rule).
Fitted from the factory on rims: 18x9, 18x9.5, 18x10.
Popular comparisons
Sizes often compared with 275/40 R18
Close alternatives — each opens in the tire size calculator.
Sidewall
275/40 R18 — what does it mean?
| Parameter | Meaning |
|---|---|
| 275 | The first number is the section width — 275 mm, or about 10.8 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 110 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. |