Aaron;

Agrees 100% and why I posted here regarding availability rather than in the Electronics section. This is a item relevant to C&V bikes from the 70s or so but it is also a relevant piece of technology for current bikes. In the same price range as bottle dynamos but more efficient and a lot cheaper to install than a hub dynamo once you add the cost of a rim and spokes to the price of the hub dynamo unit.

The biggest disadvantages I can see are the inability to fit to a CF frame or one with very tight BB to wheel clearance and difficulty of mounting along with many center and side stands which want the same frame territory for their mounting clamp. The BB dynamo does also limit the tires that can be run to relatively smooth tread tires too.