Skip to content
tirewheelguide.com

Best 235/45 R18 tires

150 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.

26.3″
overall diameter
9.3″
section width
18″
rim diameter
766.1
revs per mile

Best 235/45 R18 all-season tires

54

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

More top-rated 235/45 R18 tires

44

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

Best 235/45 R18 summer tires

34

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

Best 235/45 R18 winter tires

18

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

Conversion

235/45 R18 in inches

Overall diameter26.3″
Section width9.3″
Rim diameter18″
Sidewall height106 mm
Circumference82.7″
Revolutions per mile766.1

The closest flotation size is 28x12.00R18 — 6.4% taller and 29.7% wider. Compare them in the calculator.

Wheels

What rims fit 235/45 R18 tires?

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

Minimum
6.5″
Ideal
7.5″
Maximum
8.5″

Rim diameter is fixed at 18″ — only the width varies. Estimated from the 9.3″ section width (70–90% rule).

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

Popular comparisons

Sizes often compared with 235/45 R18

Close alternatives — each opens in the tire size calculator.

235/45R18VS215/55R17
235/45R18VS235/50R17
235/45R18VS225/40R19
Sidewall

235/45 R18 — what does it mean?

ParameterMeaning
235The first number is the section width — 235 mm, or about 9.3 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 106 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.