Check out Portland-based Renovo Hardwood Bicycles’ R4 Pursuit, made from two CNC’d halves of wood bonded together lengthwise (yielding a hollow core). I love the blending of media and these are a beautiful example of art and craftsmanship. In their web site, designer Ken Wheeler makes the argument for why wood makes for an “heirloom quality” bicycle frame that competes quite nicely against steel, aluminum and carbon bikes.
Be sure to take a look at take a look at how they make the frame, their beautiful product photography and their luscious wood selection. They also make bamboo frames. These guys have really propelled this novelty application of natural materials into art and a real-world, viable technology… These bikes are sweet.