Originally Posted by
Tourist in MSN
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.
Yeah, I wonder if that's a hub-specific difference. Do some have less friction. And is it better to use the shimano with wiring that allows you to charge your garmin during the daytime if it's going to be putting out the drag no matter what.