Dunlop D251 is a summer tyre made in total of 7 sizes, ranging from R16 to R16 - this particular dimension is R16, which means it fits to a 16 inch/406.4mm diameter wheel. 200/60 R16 is 50mm wider than the narrowest dimension (150) and -50mm narrower than the widest one (150). This tyre profile of 60 means the sidewall height of the tyre is 60% of the tyre width (200mm), which results in 120mm sidewall height. In 200/60 R16, there is only one possible speed index for Dunlop D251 - "V", which is good for speeds up to 240 km/h.