Nankang Sportnex NS-2R 315/30 R18

Nankang Sportnex NS-2R is a tyre made in total of 47 sizes, ranging from R13 to R13 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 315/30 R18 is 140mm wider than the narrowest dimension (175) and -10mm narrower than the widest one (305). This tyre profile of 30 means the sidewall height of the tyre is 30% of the tyre width (315mm), which results in 94.5mm sidewall height.