Originally Posted by
chucky
This is silly. Just because something like a SON isn't mechanically decoupled it doesn't mean it isn't decoupled. The physical world consists of more than just mechanics which pea minded cyclists can see with their eyes.
A SON disengages when you turn the lights off and that disengagement is just as real as any mechanical disengagement (which won't be 100.00% efficient either).
That's what I thought too. I'm sure there's some tiny drag from the extra friction of extra moving parts, or something, but it's probably less than what you lose by not shaving that day.