Michelin Primacy 4 is a summer tyre made in total of 239 sizes, ranging from R15 to R15 - this particular dimension is R15, which means it fits to a 15 inch/381mm diameter wheel. This tyre profile of 65 means the sidewall height of the tyre is 65% of the tyre width (165mm), which results in 107.25mm sidewall height. In 165/65 R15, there is only one possible speed index for Michelin Primacy 4 - "T", which is good for speeds up to 190 km/h.
