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cjr-
Slide a centrelock rotor onto a hub spline and notice how much rotational movement there is. When you consider you have 2 companies making 2 different parts (one for rotor, one for hub) it doesn't take much of a machine tolerance difference to create some space to allow movement. Yes I agree that pads can move in some calipers .
scultura
I always run 6 bolt anyway as centrelock always leaves the bike feeling there is headset play. Definitely rate the galfers, have made a huge difference to my braking power although I've yet to do a wet ride.