Nankang Noble Sport NS-20 255/40 R17

Nankang Noble Sport NS-20 is a summer tyre made in total of 163 sizes, ranging from R13 to R13 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 255/40 R17 is 60mm wider than the narrowest dimension (195) and -10mm narrower than the widest one (245). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (255mm), which results in 102mm sidewall height.