Tire sizes
Used 255/55R18 tires
Looking for 255/55R18? Message us your size and we will check what used tires we have. It is about 29.0 in tall with roughly 5.5 in of sidewall, a size common on midsize and larger SUVs.
- Width
- 255 mm
- Sidewall
- 140.3 mm (5.5″)
- Overall height
- ≈ 29″
- Revs per mile
- ≈ 694
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What does 255/55R18 mean?
It means a radial tire 255 mm wide with a sidewall 55% of that width, for an 18 inch wheel.
The sidewall is about 140.3 mm, or 5.5 in. Overall diameter comes to about 29.0 in, about 694 revolutions per mile.
What sizes are close to 255/55R18?
By the math, 235/65R17 (about 29.0 in) is almost exactly the same diameter as 255/55R18, and 235/60R18 (about 29.1 in) is within about 0.2%.
Both are 20 mm narrower, and one uses a 17 inch wheel. Matching diameter does not make a size approved, so stay within about 3% and confirm with your door placard and owner’s manual.
How do I read all-season and winter markings on used 255/55R18 tires?
Look on the sidewall for M+S, which means mud and snow, and for a mountain with a snowflake inside it, which means the tire passed a standard snow traction test.
Many all-season tires carry M+S only. The mountain-snowflake symbol is the one to look for if you want better grip in real winter conditions.
Snow grip also drops as tread wears, so check depth along with the markings. Stop by the shop and we will walk you through a set.
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