Viking WinTech is a winter tyre made in total of 53 sizes, ranging from R13 to R13 - this particular dimension is R19, which means it fits to a 19 inch/482.6mm diameter wheel. 255/50 R19 is 110mm wider than the narrowest dimension (145) and 20mm narrower than the widest one (275). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (255mm), which results in 127.5mm sidewall height. In 255/50 R19, there is only one possible speed index for Viking WinTech - "V", which is good for speeds up to 240 km/h. In 255/50 R19, WinTech usually competes against Radial Champiro WinterPro 2, which is a tyre from GT with a rating of 60%, compared to 58% of the Viking in question.