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355/25 R21 Michelin Pilot Sport 4 S variants
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Michelin Pilot Sport 4 S is a summer tyre made in total of 178 sizes, ranging from R18 to R18 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 355/25 R21 is 140mm wider than the narrowest dimension (215) and -40mm narrower than the widest one (315). This tyre profile of 25 means the sidewall height of the tyre is 25% of the tyre width (355mm), which results in 88.75mm sidewall height. In 355/25 R21, there is only one possible speed index for Michelin Pilot Sport 4 S - "Y", which is good for speeds up to 300 km/h. In 355/25 R21, Pilot Sport 4 S usually competes against P ZERO, which is a tyre from Pirelli with a rating of 61%, compared to 91% of the Michelin in question.
Michelin Pilot Sport 4 S is made in 178 sizes, starting from 215/35 R18 up to 315/30 R23.