Re: Michelin Pilot Sport 4 All Season now available
I don't think any top notch Michelin tire gets hard and dangerous after 5 years.
Modern rubber compounds have come a long way and if treated the right way (no excessive parking in direct sunlight, etc) perform for a long time.
As far as Michelin is concerned I'd expect they use the best stuff available for their tires.
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ZR-1 #638/1991
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