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Originally Posted by Mike Sweeney
Agree completely - and the extra fun to be had sliding around on crossplies is worth it alone. Why did Spa go the route of mixed tyres? - you'll know better than I but thought Historic FIA and VdeV also only used Dunlop CR65?
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Nothing to do with Spa. Just rules that apply under FIA App K for races over 2 hours.
http://www.fia.com/resources/documen...ppK_2006_a.pdf