Firestone Roadhawk 2 225/50 R18

Firestone Roadhawk 2 is a summer tyre made in total of 143 sizes, ranging from R16 to R16 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 225/50 R18 is 40mm wider than the narrowest dimension (185) and 60mm narrower than the widest one (285). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (225mm), which results in 112.5mm sidewall height.