Michelin Pilot Sport 4 is a summer tyre made in total of 159 sizes, ranging from R16 to R16 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 275/40 R20 is 70mm wider than the narrowest dimension (205) and 50mm narrower than the widest one (325). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (275mm), which results in 110mm sidewall height. In 275/40 R20, there is only one possible speed index for Michelin Pilot Sport 4 - "Y", which is good for speeds up to 300 km/h.
275/40 R20 102 Y mfs
A
C
69dB
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Michelin Pilot Sport 4 ZP ( 275/40 R20 102Y runflat )