I have a technical department answer on this question!
My new job involves a lot of work for Michelin, so I asked the tech bod and the warehouse manager!
Tyres are as already stated stored in a cool dry dark warehouse and are systematically destroyed after 5 years.
Them Z6's were supposed to be mine as well so a good home is waiting for them.
I still think that new fresh tyres are better than old unused ones though
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