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Best 225/40 R18 tires

177 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.

25.1″
overall diameter
8.9″
section width
18″
rim diameter
803.9
revs per mile

Best 225/40 R18 summer tires

73

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

Best 225/40 R18 all-season tires

43

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

More top-rated 225/40 R18 tires

42

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

Best 225/40 R18 winter tires

19

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

Conversion

225/40 R18 in inches

Overall diameter25.1″
Section width8.9″
Rim diameter18″
Sidewall height90 mm
Circumference78.8″
Revolutions per mile803.9

The closest flotation size is 28x12.00R18 — 11.6% taller and 35.5% wider. Compare them in the calculator.

Wheels

What rims fit 225/40 R18 tires?

A tire fits a range of rim widths. Too narrow or too wide and the sidewall changes shape.

Minimum
6″
Ideal
7″
Maximum
8″

Rim diameter is fixed at 18″ — only the width varies. Estimated from the 8.9″ section width (70–90% rule).

Fitted from the factory on rims: 18x7, 18x7.5, 18x8, 18x8.5, 18x9, 18x10, 18x11.

Popular comparisons

Sizes often compared with 225/40 R18

Close alternatives — each opens in the tire size calculator.

225/40R18VS205/50R17
225/40R18VS225/45R17
225/40R18VS235/45R17
225/40R18VS225/35R19
Sidewall

225/40 R18 — what does it mean?

ParameterMeaning
225The first number is the section width — 225 mm, or about 8.9 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 90 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.