Good morning CommUnity!
As a bike user I am always looking forward to equip my bike with smart meters, but until know I've always seen the dynamo as the only energy harvesting tool applied to the bike. Wind energy and solar energy would be two available resources that could be probably be exploited in order to generate small quantities of power.
Think for a moment not to have economical constraints or limited materials and let's limit this discussion to a pure engineering discussion. Would you forsee its feasibility?
Somebody once told me that a problem should not be considered for the final solutions it generates, but for the intermediate discoveres while reaching those solutions. So don't hesitate to propose weird solutions