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Spec tire push legitimately tends to come from the series side, because a tire war is a disruptive element to their micromanaging and official supplier contracts are profit centers. Up until recently Michelin didn't want back into F1 unless it was with competition. Being a tire supplier at the pro level doesn't benefit from scale the way a car builder does, it's expensive and difficult to transport and manage the hundreds to thousands of tires to supply a full field.
Some manufacturers that will consistently get their crap pushed in with a tire war like Goodyear and Pirelli like them, but that's about it.
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