Nankang Econex NA-1 is a tyre made in total of 53 sizes, ranging from R13 to R13 - this particular dimension is R15, which means it fits to a 15 inch/381mm diameter wheel. 195/50 R15 is 60mm wider than the narrowest dimension (135) and -20mm narrower than the widest one (175). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (195mm), which results in 97.5mm sidewall height. In 195/50 R15, there is only one possible speed index for Nankang Econex NA-1 - "", which is good for speeds up to km/h.