Indy was one of many tracks that had issues with cars having the dreaded "aero push" as well as long green runs leading to a spread out field. The '08 fiasco that NASCAR and Goodyear were chiefly culpable for was the beginning of the end.
With some exceptions, the new car seems to put on better racing at the aero tracks, and Goodyear has had a lot less failures with their current tires than the old high profile tires used until the Generation 7 car. Maybe Goodyear had to lean on Dunlop (who I believe make the Goodyear branded tires that are used in the WEC and other series--Goodyear owns Dunlop's tire operations) to develop the current low profile tires.
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