Semperit Speed-Grip 3 SUV is a winter tyre made in total of 15 sizes, ranging from R17 to R17 - this particular dimension is R19, which means it fits to a 19 inch/482.6mm diameter wheel. This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (205mm), which results in 112.75mm sidewall height. In 205/55 R19, there is only one possible speed index for Semperit Speed-Grip 3 SUV - "H", which is good for speeds up to 210 km/h.