Gt Radial Winter Pro 2 Sport is a tyre made in total of 22 sizes, ranging from R17 to R17 - this particular dimension is R19, which means it fits to a 19 inch/482.6mm diameter wheel. 235/45 R19 is 30mm wider than the narrowest dimension (205) and 0mm narrower than the widest one (235). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (235mm), which results in 105.75mm sidewall height. In 235/45 R19, there is only one possible speed index for Gt Radial Winter Pro 2 Sport - "V", which is good for speeds up to 240 km/h.