Michelin ALPIN 7 is a winter tyre made in total of 61 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 40mm wider than the narrowest dimension (185) and -30mm narrower than the widest one (195). 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 are 2 possible speed indexes for Michelin ALPIN 7 - "H","V", which are good for speeds up to 210, 240 km/h. In 225/55 R17, ALPIN 7 usually competes against ALPIN 5, which is a tyre from Michelin with a rating of %, compared to 0% of the Michelin in question.