Pirelli Scorpion ZERO is a summer tyre made in total of 11 sizes, ranging from R18 to R18 - this particular dimension is R19, which means it fits to a 19 inch/482.6mm diameter wheel. 275/55 R19 is 40mm wider than the narrowest dimension (235) and -10mm narrower than the widest one (265). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (275mm), which results in 151.25mm sidewall height. In 275/55 R19, there are 2 possible speed indexes for Pirelli Scorpion ZERO - "H","V", which are good for speeds up to 210, 240 km/h.