Michelin Primacy 4+ 255/50 R18

Michelin Primacy 4+ is a summer tyre made in total of 127 sizes, ranging from R16 to R16 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 255/50 R18 is 70mm wider than the narrowest dimension (185) and -10mm narrower than the widest one (245). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (255mm), which results in 127.5mm sidewall height. In 255/50 R18, Primacy 4+ usually competes against Turanza T005, which is a tyre from Bridgestone with a rating of 83%, compared to 71% of the Michelin in question.