Cooper Trendsetter Se is a tyre made in total of 7 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 75 means the sidewall height of the tyre is 75% of the tyre width (205mm), which results in 153.75mm sidewall height. In 205/75 R15, there is only one possible speed index for Cooper Trendsetter Se - "S", which is good for speeds up to 180 km/h.