Nankang Winter Activa SV-55 255/45 R18

Nankang Winter Activa SV-55 is a winter tyre made in total of 53 sizes, ranging from R15 to R15 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 255/45 R18 is 60mm wider than the narrowest dimension (195) and 60mm narrower than the widest one (315). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (255mm), which results in 114.75mm sidewall height.