I'm curious why DTM has spec Hankooks, though. The only reason I can think of is that Hankook pays quite a good amount for it.
DTM can't claim cost cuting with spec tyres because, in SuperGT, Bridgestone supplies it's tyres for free and Dunlop and Yokohama(which will always have inferior tyres to the other big two tyre manufacturers) actually pays for the few GT500 teams to run on their rubber.
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