305/40 R20 Nokian WR SUV 4 variants

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Nokian WR SUV 4 is a winter tyre made in total of 69 sizes, ranging from R16 to R16 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 305/40 R20 is 90mm wider than the narrowest dimension (215) and 10mm narrower than the widest one (315). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (305mm), which results in 122mm sidewall height. In 305/40 R20, WR SUV 4 usually competes against WR SUV 3, which is a tyre from Nokian with a rating of 0%, compared to 26% of the Nokian in question.