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First, my take is that the organisers are trying to make sure that the later cars don’t have a huge tyre advantage, which would be the case with slicks or Yokos. I seem to remember that there was some disquiet when the race was first run regarding different cornering speeds.
Avon ZZs are virtually universally used in the Spa 6hrs. They’re radials, for a start, wear well, are good in the dry and excellent in the wet. Personally, I wouldn’t even consider Dunlop Post Historic over them.
The one disadvantage of the Avons is that they are heavy in comparison, but I’ve raced a few cars on Dunlop Ls and ZZs in different races without having to change any settings. But I am lazy!
The other factor to consider is the sizes available and making sure there is one suitable for your car.....
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