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The steel bearings in that first vid are mis-adjusted, or maybe the brakes are dragging. Notice the partial ceramic wheel gradually drags to a stop, then oscillates back and forth due to the wheel being slightly off balance? Properly adjusted steel bearings do that too... For some reason, the ones in the video do not.
If they're willing to misrepresent existing tech, it makes me wonder if they gave the full ceramic wheel an additional edge. Like, say... Lining the rim with weights to give it more momentum.
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