Tires Size 235/40R18
Dimensions, specs, and every size 235/40R18 tire currently in stock
25.4"
645 mm · calculated
235 mm
9.25 inches
3.7"
94 mm · 40% profile
18"
457.2 mm
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235/40R18 Specifications
Read directly from the size code. Load index, speed rating, and rim width range vary by model.
| Specification | Imperial | Metric |
|---|---|---|
| Section width | 9.25 in | 235 mm |
| Aspect ratio | 40% | — |
| Sidewall height | 3.7 in | 94 mm |
| Overall diameter (calculated) | 25.4 in | 645 mm |
| Wheel / rim diameter | 18 in | 457.2 mm |
| Construction | Radial | — |
What does 235/40R18 mean?
Reading the code on your sidewall
235 mm
The distance from sidewall to sidewall across the tire's widest point.
40% profile
The sidewall stands 40% of the section width, which is 94 mm on this size.
Radial
The body plies run across the tire at right angles to the direction of travel.
18 in
Fits a wheel measuring 18 inches across.
235/40R18 Questions & Answers
Dimensions and fitment guidelines for size 235/40R18
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