Nankang Winter Activa SV-55 is a winter tyre made in total of 51 sizes, ranging from R15 to R15 - this particular dimension is R19, which means it fits to a 19 inch/482.6mm diameter wheel. 225/55 R19 is 30mm wider than the narrowest dimension (195) and 90mm narrower than the widest one (315). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (225mm), which results in 123.75mm sidewall height. In 225/55 R19, there is only one possible speed index for Nankang Winter Activa SV-55 - "V", which is good for speeds up to 240 km/h. In 225/55 R19, Winter Activa SV-55 usually competes against Wintrac Pro, which is a tyre from Vredestein with a rating of 68%, compared to 0% of the Nankang in question.