Hankook Ventus Prime3 K125 is a summer tyre made in total of 149 sizes, ranging from R15 to R15 - this particular dimension is R16, which means it fits to a 16 inch/406.4mm diameter wheel. 205/50 R16 is 20mm wider than the narrowest dimension (185) and -10mm narrower than the widest one (195). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (205mm), which results in 102.5mm sidewall height. In 205/50 R16, there are 2 possible speed indexes for Hankook Ventus Prime3 K125 - "V","W", which are good for speeds up to 240, 270 km/h.
