Michelin Primacy 4 225/55 R18

Michelin Primacy 4 is a summer tyre made in total of 386 sizes, ranging from R14 to R14 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 225/55 R18 is 70mm wider than the narrowest dimension (155) and 80mm narrower than the widest one (305). 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 R18, Primacy 4 usually competes against Primacy 5, which is a tyre from Michelin with a rating of 84%, compared to 0% of the Michelin in question.