Michelin Pilot Sport 4 is a summer tyre made in total of 159 sizes, ranging from R16 to R16 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (205mm), which results in 92.25mm sidewall height. In 205/45 R17, there are 3 possible speed indexes for Michelin Pilot Sport 4 - "V","Y","W", which are good for speeds up to 240, 300, 270 km/h.