315/40 R21 Michelin Primacy 4 variants

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Michelin Primacy 4 is a summer tyre made in total of 240 sizes, ranging from R15 to R15 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 315/40 R21 is 150mm wider than the narrowest dimension (165) and -60mm narrower than the widest one (255). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (315mm), which results in 126mm sidewall height. In 315/40 R21, Primacy 4 usually competes against PremiumContact 6, which is a tyre from Continental with a rating of 83%, compared to 82% of the Michelin in question.