Tires Size 255/55R18
Dimensions, specs, and every size 255/55R18 tire currently in stock
29.04"
738 mm · calculated
255 mm
10.04 inches
5.52"
140.3 mm · 55% profile
18"
457.2 mm
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255/55R18 Specifications
Read directly from the size code. Load index, speed rating, and rim width range vary by model.
| Specification | Imperial | Metric |
|---|---|---|
| Section width | 10.04 in | 255 mm |
| Aspect ratio | 55% | — |
| Sidewall height | 5.52 in | 140.3 mm |
| Overall diameter (calculated) | 29.04 in | 738 mm |
| Wheel / rim diameter | 18 in | 457.2 mm |
| Construction | Radial | — |
What does 255/55R18 mean?
Reading the code on your sidewall
255 mm
The distance from sidewall to sidewall across the tire's widest point.
55% profile
The sidewall stands 55% of the section width, which is 140.3 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.
255/55R18 Questions & Answers
Dimensions and fitment guidelines for size 255/55R18
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