Originally Posted by carleton

That probably won't happen. I'm pretty sure that the UCI still requires a double triangle "diamond" frame which requires a top tube, a down tube, a seat tube, seat stays, and chain stays.



Some of the bikes from the 90s left off one of the above.

No top tube or seat stay:



No down tube or seat stay:



I would LOVE to see these designs be revisited using modern carbon materials and techniques.