Hankook Ventus S1-evo is a summer tyre made in total of 0 sizes, ranging from R13 to R13 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 235/30 R20 is 235mm wider than the narrowest dimension () and -235mm narrower than the widest one (). This tyre profile of 30 means the sidewall height of the tyre is 30% of the tyre width (235mm), which results in 70.5mm sidewall height.