Hankook Winter I-Cept iOn X is a winter tyre made in total of 23 sizes, ranging from R18 to R18 - this particular dimension is R19, which means it fits to a 19 inch/482.6mm diameter wheel. 255/45 R19 is 20mm wider than the narrowest dimension (235) and 40mm narrower than the widest one (295). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (255mm), which results in 114.75mm sidewall height. In 255/45 R19, there is only one possible speed index for Hankook Winter I-Cept iOn X - "V", which is good for speeds up to 240 km/h. In 255/45 R19, Winter I-Cept iOn X usually competes against Sportcontact 6, which is a tyre from Continental with a rating of 77%, compared to 0% of the Hankook in question.