Firestone Winterhawk 4 225/55 R18

Firestone Winterhawk 4 is a winter tyre made in total of 102 sizes, ranging from R14 to R14 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 225/55 R18 is 70mm wider than the narrowest dimension (155) and 50mm narrower than the widest one (275). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (225mm), which results in 123.75mm sidewall height. In 225/55 R18, Winterhawk 4 usually competes against Blizzak LM-005, which is a tyre from Bridgestone with a rating of 82%, compared to 56% of the Firestone in question.