Forget the carbon-fiber bike that costs more than your house. How about one made of plastic? The Innervision bike is a design concept by industrial designer Matt Clark that ditches high-cost complex materials for pre-molded plastic parts.

Clark's design eliminates the labor-intensive welding and heat treatment process associated with modern bike manufacturing. The current prototype has an inner and outer frame that is made of polypropylene -- that could be replaced with recycled plastic in the future. Prototype components were thermoformed and welded together without adhesives, but future versions could be compression-molded. While we're not expecting Lance to saddle up anytime soon, a lower-cost alternative for more social riders might be of interest.