255/40 R21 Kumho WinterCraft WP51 variants

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Kumho WinterCraft WP51 is a winter tyre made in total of 66 sizes, ranging from R13 to R13 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 255/40 R21 is 110mm wider than the narrowest dimension (145) and -30mm narrower than the widest one (225). 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, WinterCraft WP51 usually competes against Winterhawk 3, which is a tyre from Firestone with a rating of 0%, compared to 20% of the Kumho in question.