193Best 245/45 R18 tires
156 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.
26.7″
overall diameter
9.6″
section width
18″
rim diameter
755.9
revs per mile
Best 245/45 R18 summer tires
53193
289
386
484
584
689
782
882
982
1082
1189
128041 more rated tires in this size are listed on their brand pages.
Best 245/45 R18 all-season tires
51
189
289
388
488
588
691
786
886
985
1084
1184
128539 more rated tires in this size are listed on their brand pages.
More top-rated 245/45 R18 tires
33
192
288
388
490
588
688
786
887
985
1083
1184
128321 more rated tires in this size are listed on their brand pages.
Best 245/45 R18 winter tires
19
192
291
484
580
680
786
878
978
1077
1176
12767 more rated tires in this size are listed on their brand pages.
Conversion
245/45 R18 in inches
| Overall diameter | 26.7″ |
| Section width | 9.6″ |
| Rim diameter | 18″ |
| Sidewall height | 110 mm |
| Circumference | 83.8″ |
| Revolutions per mile | 755.9 |
The closest flotation size is 28x12.00R18 — 4.9% taller and 24.4% wider. Compare them in the calculator.
Wheels
What rims fit 245/45 R18 tires?
A tire fits a range of rim widths. Too narrow or too wide and the sidewall changes shape.
Minimum
7″
Ideal
7.5″
Maximum
8.5″
Rim diameter is fixed at 18″ — only the width varies. Estimated from the 9.6″ section width (70–90% rule).
Fitted from the factory on rims: 18x7.5, 18x8, 18x8.5, 18x9, 18x9.5.
Popular comparisons
Sizes often compared with 245/45 R18
Close alternatives — each opens in the tire size calculator.
Sidewall
245/45 R18 — what does it mean?
| Parameter | Meaning |
|---|---|
| 245 | The first number is the section width — 245 mm, or about 9.6 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 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. |