Nankang CROSS SEASONS AW-6 is a allround tyre made in total of 78 sizes, ranging from R13 to R13 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/50 R18 is 80mm wider than the narrowest dimension (155) and 20mm narrower than the widest one (255). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (235mm), which results in 117.5mm sidewall height. In 235/50 R18, there is only one possible speed index for Nankang CROSS SEASONS AW-6 - "Y", which is good for speeds up to 300 km/h. In 235/50 R18, CROSS SEASONS AW-6 usually competes against Kinergy 4S2 H750, which is a tyre from Hankook with a rating of 89%, compared to 23% of the Nankang in question.