Dynamos für die Fahrradbeleuchtung: Unterschied zwischen den Versionen

===Nabendynamos===

These replace the normal front (or rarely, rear) hub.  They are installed by building or rebuilding the wheel, unless bought as part of the wheel.  Most have no extraneous moving parts, although a very few have on-off clutches to further reduce drag.  Hub units are usually judged to be the best bike generators, and are rapidly gaining market share, especially as original equipment on European utility bikes, since this avoids the cost of (re)building a wheel.