Michelin Pilot Sport 3 is a summer tyre made in total of 60 sizes, ranging from R15 to R15 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 225/40 R18 is 30mm wider than the narrowest dimension (195) and 60mm narrower than the widest one (285). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (225mm), which results in 90mm sidewall height. In 225/40 R18, there are 2 possible speed indexes for Michelin Pilot Sport 3 - "Y","W", which are good for speeds up to 300, 270 km/h. In 225/40 R18, Pilot Sport 3 usually competes against P ZERO, which is a tyre from Pirelli with a rating of 0%, compared to 0% of the Michelin in question.
