Nokian Rotiiva AT is a winter tyre made in total of 32 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 (235mm), which results in 176.25mm sidewall height. In 235/75 R15, there are 2 possible speed indexes for Nokian Rotiiva AT - "T","S", which are good for speeds up to 190, 180 km/h.