Abstract: Techniques for making carbon fiber bicycle frames. The techniques include techniques for making a chain stay-seat stay structure that includes carbon fiber tubes that are differentially stiff and techniques for making carbon fiber lugs for the frames. One of the techniques for making the chain stay-seat stay structure includes a wish bone seat stay in which the root tube of the seat stay has an oval cross section, so that the root tube is stiffer in the horizontal direction than it is in the vertical direction. Another of the techniques is a dual seat stay chain stay-seat stay structure in which the tubes of the structure have lay-ups such that the tubes are stiffer when bent than when twisted.