3 links have been added on this idea.
  1. Not entirely plastic bicycles, but you can buy replacement wheels made of plastic materials.

  2. Awesome concept! Check out this company that makes bicycles using plastic bottle caps. And the best part, you can return them to the factory to be recycled when they are too worn out. https://innovationorigins.com/en/startup-of-the-day-cycling-on-a-bicycle-made-of-used-plastic-bottle-caps/