Michelin SCORCHER 31 is a winter tyre made in total of 11 sizes, ranging from R16 to R16 - this particular dimension is R16, which means it fits to a 16 inch/406.4mm diameter wheel. 180/70 R16 is 50mm wider than the narrowest dimension (130) and -50mm narrower than the widest one (130). This tyre profile of 70 means the sidewall height of the tyre is 70% of the tyre width (180mm), which results in 126mm sidewall height. In 180/70 R16, there is only one possible speed index for Michelin SCORCHER 31 - "H", which is good for speeds up to 210 km/h.