Hankook Winter I-Cept iOn is a winter tyre made in total of 15 sizes, ranging from R18 to R18 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (215mm), which results in 96.75mm sidewall height. In 215/45 R20, there is only one possible speed index for Hankook Winter I-Cept iOn - "H", which is good for speeds up to 210 km/h.