Michelin Primacy 3 is a summer tyre made in total of 175 sizes, ranging from R16 to R16 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/50 R18 is 50mm wider than the narrowest dimension (185) and -40mm narrower than the widest one (195). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (235mm), which results in 117.5mm sidewall height. In 235/50 R18, there are 2 possible speed indexes for Michelin Primacy 3 - "W","Y", which are good for speeds up to 270, 300 km/h. In 235/50 R18, Primacy 3 usually competes against Primacy 4, which is a tyre from Michelin with a rating of 82%, compared to 0% of the Michelin in question. Latest test in 235/50 R18 was held by Autobild in 2017, where Primacy 3 received rating "Exemplary" and finished on the 4. place. It was tested on a .
