Dunlop SP Winter Sport 4D is a winter tyre made in total of 43 sizes, ranging from R15 to R15 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 225/55 R17 is 30mm wider than the narrowest dimension (195) and 60mm narrower than the widest one (285). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (225mm), which results in 123.75mm sidewall height. In 225/55 R17, there is only one possible speed index for Dunlop SP Winter Sport 4D - "H", which is good for speeds up to 210 km/h.
