Sumitomo Wt200 is a tyre made in total of 39 sizes, ranging from R13 to R13 - this particular dimension is R13, which means it fits to a 13 inch/330.2mm diameter wheel. This tyre profile of 70 means the sidewall height of the tyre is 70% of the tyre width (155mm), which results in 108.5mm sidewall height. In 155/70 R13, there is only one possible speed index for Sumitomo Wt200 - "T", which is good for speeds up to 190 km/h.