Fascinating stuff. Still trying to figure out how it works exactly but something to keep your eyes open about. Check out the link Copenhagen Wheel and the teaser.
"Smart, responsive and elegant, the Copenhagen Wheel is a new emblem
for urban mobility. It transforms ordinary bicycles quickly into hybrid e-bikes that also function as mobile sensing units. The Copenhagen Wheel allows you to capture
the energy dissipated while cycling and braking and save it for when you need
a bit of a boost. It also maps pollution levels, traffic congestion,
and road conditions in real-time".