Bigger rotors create a substantial weight percentage increase at each corner that your shocks need to cope with, then there's the additional rotational mass. A big heavy flywheel on a dirt bike is something you can related too!
Ever been to a historic Trans Am race and noticed the lap times they run vs the spec brakes they have to run? They scrub speed pretty good considering.
Caliper clamping force trumps rotor size IMO.
More isn't always better.
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