Toyo Proxes T1R is a summer tyre made in total of 21 sizes, ranging from R14 to R14 - this particular dimension is R15, which means it fits to a 15 inch/381mm diameter wheel. This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (195mm), which results in 107.25mm sidewall height. In 195/55 R15, there is only one possible speed index for Toyo Proxes T1R - "V", which is good for speeds up to 240 km/h.