Michelin Pilot Alpin PA4 265/30 R21

Michelin Pilot Alpin PA4 is a winter tyre made in total of 116 sizes, ranging from R17 to R17 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 265/30 R21 is 40mm wider than the narrowest dimension (225) and 80mm narrower than the widest one (345). This tyre profile of 30 means the sidewall height of the tyre is 30% of the tyre width (265mm), which results in 79.5mm sidewall height.