Firestone Winterhawk 4 is a winter tyre made in total of 100 sizes, ranging from R14 to R14 - this particular dimension is R16, which means it fits to a 16 inch/406.4mm diameter wheel. 195/55 R16 is 40mm wider than the narrowest dimension (155) and 80mm narrower than the widest one (275). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (195mm), which results in 107.25mm sidewall height. In 195/55 R16, there is only one possible speed index for Firestone Winterhawk 4 - "H", which is good for speeds up to 210 km/h. In 195/55 R16, Winterhawk 4 usually competes against Blizzak LM-005, which is a tyre from Bridgestone with a rating of 87%, compared to 65% of the Firestone in question.