Radar Dimax Alpine is a winter tyre made in total of 21 sizes, ranging from R15 to R15 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 215/55 R17 is 20mm wider than the narrowest dimension (195) and 20mm narrower than the widest one (235). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (215mm), which results in 118.25mm sidewall height. In 215/55 R17, there is only one possible speed index for Radar Dimax Alpine - "V", which is good for speeds up to 240 km/h. In 215/55 R17, Dimax Alpine usually competes against I FIT LW31, which is a tyre from Laufenn with a rating of 51%, compared to 48% of the Radar in question.