255/55 R18 Michelin Primacy 4+ variants

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Michelin Primacy 4+ is a summer tyre made in total of 122 sizes, ranging from R16 to R16 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 255/55 R18 is 70mm wider than the narrowest dimension (185) and -10mm narrower than the widest one (245). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (255mm), which results in 140.25mm sidewall height. In 255/55 R18, Primacy 4+ usually competes against PremiumContact 7, which is a tyre from Continental with a rating of 99%, compared to 77% of the Michelin in question.