Wow! Light, durable, cheap (and with a belt drive):
Interesting idea, indeed…btw. here’s a video:
…what about this cardboard bike, built by Phil Bridge of UK (in 2008)?
Well… both for chain or belt system are very interesting to me, because this is a " cardboard" made bike. I think the chain system one, may not expensive, maybe it might be very cheap, but for belt system… hummm I think it may expensive than the chain one, not just about system, also it need to change or redesign the frame.