Hankook Dynapro HP2 RA33 is a summer tyre made in total of 56 sizes, ranging from R15 to R15 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 255/50 R20 is 70mm wider than the narrowest dimension (185) and 30mm narrower than the widest one (285). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (255mm), which results in 127.5mm sidewall height. In 255/50 R20, there are 2 possible speed indexes for Hankook Dynapro HP2 RA33 - "H","V", which are good for speeds up to 210, 240 km/h.