Pirelli Diablo Supercorsa V4 is a summer tyre made in total of 3 sizes, ranging from R17 to R17 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 205/55 R17 is 85mm wider than the narrowest dimension (120) and 0mm narrower than the widest one (205). 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 R17, there is only one possible speed index for Pirelli Diablo Supercorsa V4 - "W", which is good for speeds up to 270 km/h. In 205/55 R17, Diablo Supercorsa V4 usually competes against Quatrac Pro+, which is a tyre from Vredestein with a rating of 52%, compared to 0% of the Pirelli in question.