my understanding is that when you spin wheel you will notice drag, but it 
doesn't generate as much power as your legs. So when you are actually 
riding at high speeds the drag is less noticeable. I could be wrong. i've 
got dyno hubs on all my bikes and haven't felt noticeable drag, but then 
again, i haven't rode a non-dyno hub wheelset in 3 years.

On Wednesday, September 28, 2016 at 11:44:24 AM UTC-4, Jim S. wrote:
>
> Hi all,
>
> I was curious about the effect on drag of turning my dynamo headlight on 
> or off. 
>
> So I flipped my bicycle over, spun the wheel, and compared "light on" to 
> "light off." The answer, unremarkably, is that the dynamo does cause some 
> drag. Maybe more than I expected.
>
> But I'm curious - can I reduce drag even more by unplugging the dynamo 
> wires? The answer is probably clear and obvious to those who understand how 
> these things work, but I couldn't really tell from my clumsy attempts to 
> spin the wheel and compare. Hard to know if I'm spinning with exactly the 
> same force, etc. 
>
> Does anybody know the answer?
>
>
>

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