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Best 245/40 R18 tires

167 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.

25.7″
overall diameter
9.6″
section width
18″
rim diameter
784.2
revs per mile

Best 245/40 R18 summer tires

76

64 more rated tires in this size are listed on their brand pages.

Best 245/40 R18 all-season tires

42

30 more rated tires in this size are listed on their brand pages.

More top-rated 245/40 R18 tires

33

21 more rated tires in this size are listed on their brand pages.

Best 245/40 R18 winter tires

16

4 more rated tires in this size are listed on their brand pages.

Conversion

245/40 R18 in inches

Overall diameter25.7″
Section width9.6″
Rim diameter18″
Sidewall height98 mm
Circumference80.8″
Revolutions per mile784.2

The closest flotation size is 28x12.00R18 — 8.9% taller and 24.4% wider. Compare them in the calculator.

Wheels

What rims fit 245/40 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 245/40 R18

Close alternatives — each opens in the tire size calculator.

245/40R18VS225/50R17
245/40R18VS225/45R18
245/40R18VS245/45R17
Sidewall

245/40 R18 — what does it mean?

ParameterMeaning
245The first number is the section width — 245 mm, or about 9.6 inches across the widest part of the tire.
40The second number is the aspect ratio: sidewall height as a percentage of width. At 40%, the sidewall is about 98 mm tall.
R18R means radial construction, which nearly all modern tires use. The number is the rim diameter in inches — this tire fits a 18-inch wheel.