Michelin Pilot Sport CUP 2 is a summer tyre made in total of 130 sizes, ranging from R17 to R17 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 225/45 R18 is 10mm wider than the narrowest dimension (215) and 100mm narrower than the widest one (325). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (225mm), which results in 101.25mm sidewall height. In 225/45 R18, there is only one possible speed index for Michelin Pilot Sport CUP 2 - "Y", which is good for speeds up to 300 km/h. In 225/45 R18, Pilot Sport CUP 2 usually competes against Premitra HP5, which is a tyre from Maxxis with a rating of 56%, compared to 0% of the Michelin in question.