Originally Posted by
tatfiend
Another option is a bottom bracket mount dynamo. Supposed to be quieter and more efficient than the bottle dynamos though not as low drag as the hub dynamo. Peter White Cycles is bringing in the Sanyo model and selling it for less than the Dymotec 6 bottle generator, $44.
Fitting a BB dynamo can be quite challenging, particularly if one would want to include a kickstand behind the BB as well.