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tirewheelguide.com

Best 225/45 R18 tires

179 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″
overall diameter
8.9″
section width
18″
rim diameter
776.5
revs per mile

Best 225/45 R18 all-season tires

60

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

Best 225/45 R18 summer tires

57

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

More top-rated 225/45 R18 tires

35

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

Best 225/45 R18 winter tires

27

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

Conversion

225/45 R18 in inches

Overall diameter26″
Section width8.9″
Rim diameter18″
Sidewall height101 mm
Circumference81.6″
Revolutions per mile776.5

The closest flotation size is 28x12.00R18 — 7.8% taller and 35.5% wider. Compare them in the calculator.

Wheels

What rims fit 225/45 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: 18x6.5, 18x7, 18x7.5, 18x8, 18x8.5, 18x9.

Popular comparisons

Sizes often compared with 225/45 R18

Close alternatives — each opens in the tire size calculator.

225/45R18VS225/50R17
225/45R18VS245/40R18
225/45R18VS225/40R19
225/45R18VS245/35R19
Sidewall

225/45 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.
45The second number is the aspect ratio: sidewall height as a percentage of width. At 45%, the sidewall is about 101 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.