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265 = Width of tire in Millimetres

40 = Ratio of height to width (aspect ratio)

Z = Speed rating for over 150Mph (240Kph)

R = Radial - the construction of the tire

18 = Diameter in inches of the wheel the tire is designed to fit.

In summary, this tire is for a sports car with 18 inch wheels.

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14y ago
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Q: What does 265 40 zr18 mean?
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