Michelin Primacy 5 255/40 R21

Michelin Primacy 5 is a summer tyre made in total of 170 sizes, ranging from R16 to R16 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 255/40 R21 is 60mm wider than the narrowest dimension (195) and 20mm narrower than the widest one (275). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (255mm), which results in 102mm sidewall height. In 255/40 R21, Primacy 5 usually competes against Turanza T005, which is a tyre from Bridgestone with a rating of 88%, compared to 86% of the Michelin in question.