235/40 R18 Firestone Winterhawk 4 variants

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Firestone Winterhawk 4 is a winter tyre made in total of 100 sizes, ranging from R14 to R14 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/40 R18 is 80mm wider than the narrowest dimension (155) and 40mm narrower than the widest one (275). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (235mm), which results in 94mm sidewall height. In 235/40 R18, Winterhawk 4 usually competes against WinterExpert, which is a tyre from Uniroyal with a rating of 64%, compared to 65% of the Firestone in question.