255/40 R21 Semperit Speed-Grip 3 variants

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Semperit Speed-Grip 3 is a winter tyre made in total of 49 sizes, ranging from R15 to R15 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 255/40 R21 is 70mm wider than the narrowest dimension (185) and -60mm narrower than the widest one (195). 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 3 usually competes against Speed-Grip 5, which is a tyre from Semperit with a rating of 67%, compared to 73% of the Semperit in question.