255/40 R21 Semperit Speed-Grip 5 variants

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Semperit Speed-Grip 5 is a winter tyre made in total of 92 sizes, ranging from R14 to R14 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 255/40 R21 is 90mm wider than the narrowest dimension (165) and 20mm narrower than the widest one (275). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (255mm), which results in 102mm sidewall height. In 255/40 R21, Speed-Grip 5 usually competes against Polaris 5, which is a tyre from Barum with a rating of 63%, compared to 67% of the Semperit in question.