Originally Posted by
antimonysarah
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..., and I absolutely can, in some conditions, feel the dyno hub.
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I'd leaned it in the shade, I could see the standlight still faintly glowing. Turned it off,...
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...On the next couple of rollers, I match his posture -- tucked if he's tucked, fully upright if he is, and the same thing keeps happening. So I tell him to turn off his lights, match his posture once more, and we go down the next hill in perfect unison.
This is the first I have read of someone that could see the difference riding with a dyno powered light on.
If I lift my front wheel off the ground and give it a spin, if my light is off it will spin the same as if it was a non-dyno hub. Turn the light on and give it a spin, and the wheel slows much more quickly. The extra draw from the headlight clearly adds drag when I do that.
I could readily see that with a SP PV8, the difference on my Shimano hub it was less obvious but still apparent.
So, not only have I read about the wattage losses, I have seen the difference on my own bike. But, when I am riding I can't feel the difference.