255/40 R21 Nokian WR Snowproof variants

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Nokian WR Snowproof is a winter tyre made in total of 59 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 -40mm narrower than the widest one (215). 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, WR Snowproof usually competes against MS Plus 77, which is a tyre from Uniroyal with a rating of 55%, compared to 55% of the Nokian in question.