Michelin Primacy 4 is a summer tyre made in total of 383 sizes, ranging from R14 to R14 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/55 R18 is 80mm wider than the narrowest dimension (155) and 70mm narrower than the widest one (305). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (235mm), which results in 129.25mm sidewall height. In 235/55 R18, there are 2 possible speed indexes for Michelin Primacy 4 - "V","W", which are good for speeds up to 240, 270 km/h. In 235/55 R18, Primacy 4 usually competes against e.Primacy, which is a tyre from Michelin with a rating of 71%, compared to 77% of the Michelin in question. Latest test in 235/55 R18 was held by Tyre Reviews in 2021, where Primacy 4 received rating "Test winner" and finished on the 1. place. It was tested on a .
