Firestone Multiseason 2 is a winter tyre made in total of 60 sizes, ranging from R13 to R13 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/45 R18 is 80mm wider than the narrowest dimension (155) and 0mm narrower than the widest one (235). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (235mm), which results in 105.75mm sidewall height. In 235/45 R18, there is only one possible speed index for Firestone Multiseason 2 - "W", which is good for speeds up to 270 km/h. In 235/45 R18, Multiseason 2 usually competes against HA32 Solus 4S, which is a tyre from Kumho with a rating of 67%, compared to 60% of the Firestone in question.