Michelin PILOT ROAD 4 180/55 R17

Michelin PILOT ROAD 4 is a winter tyre made in total of 7 sizes, ranging from R17 to R17 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 180/55 R17 is 30mm wider than the narrowest dimension (150) and 10mm narrower than the widest one (190). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (180mm), which results in 99mm sidewall height.