Keep in mind, the Continentals that were used in both Prototype and GTD at Daytona and Watkins Glen the last few years were the much harder compound (because of the loads/failures). The difference between those "speedway" Continentals and the Michelins is much larger than the difference between the Continental "sprint" tire and the standard Michelins.
My understanding is Michelin is going to have 2 compounds available (dictated by them/IMSA, not the teams.. they don't get a choice) based on the estimated ambient temps. They have a "hot weather" tire and a "cooler weather" tire.
Talking with some of the GTD drivers the Michelins have a much quicker/steeper drop-off in terms of grip/time but that's to be expected from a normal racing slick. It should have an interesting effect on the strategy/race pace of the GTD and Prototypes. The Continental was very hard/conservative which made for less of a drop off.
-mike
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