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Uh? The front wheel one does the same?
Unless these one also have an internal battery, in which case yes, you're right.
But still good IMHO.
anidel-
What I mean is the front one works any time you're rolling whilst BB dynamo works only when you're pedaling. With no stand light/capacitors/batteries/etc. and only a BB dynamo you'd have no lights if you coasted down a hill for example. Also it'd have to be quite robust to withstand full torque and the cabling would be complicated with two dynamos. Just some first order considerations, it could work though
frankenbike
A BB dynamo would only provide power when you pedal. Not much use for lights