One very common mistake made during these "rotational mass" discussion is the omission of the fact that the distribution of weight and it's distance from the center is absolute key. So for example.
1kg drop in tire > 1kg drop in wheel weight > 1kg drop in rotors.
Dropping a kb in the rotors does not have the same factor of 5 effect. Dropping a kg from the tires does.
I don't think you'll feel forward and backward acceleration improvement with the rotor's mass reduction.
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