I have a French Soubitez bottom bracket generator on one of my toruing bikes, it mounts under & behind the BB & runs against the tread of the rear tire. operates a 3 watt halogen headlight that gives a fairly bright rectangular light pattern. It doesn't slip in rainy weather & has very little drag. I haven't had any problems with it but it does have the drawback of living in a very poor location & may not be available any more. I have a Dynohub driving a Lumotec headlight on my main Winter bike. It is silent & very reliable with no apparent drag. Of course if it ever fails, replacement parts are not available. I also recomment the Vistalight Super Nova Blinkie lights for the rear. Don