Dunlop K555 is a summer tyre made in total of 10 sizes, ranging from R15 to R15 - this particular dimension is R16, which means it fits to a 16 inch/406.4mm diameter wheel. 170/70 R16 is 30mm wider than the narrowest dimension (140) and -60mm narrower than the widest one (110). This tyre profile of 70 means the sidewall height of the tyre is 70% of the tyre width (170mm), which results in 119mm sidewall height. In 170/70 R16, there is only one possible speed index for Dunlop K555 - "H", which is good for speeds up to 210 km/h.