Regarding the use of CR6ZZ at the Nordschleife Marathon race or for the 6 Hours, I think it's more about the events being used to very mixed conditions and ensuring the safety of the entries more or less.
On tyre manufacturers competition, I forgot to add something. Looking at the market of historic tyres, surely it looks big from an insider point of view but looking at the facilities, specific equipment, and all the fabrication process as well as cost of putting all that together, I think it's fair to say that it doesn't look as interesting as you would think for the suppliers. The market is in reality very tiny compared to modern motorsport for the people sitting in the high offices and so is the interest they have for it...
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