Originally Posted by
MassiveD
If I wanted the frame to be a lot stiffer laterally, I would probably go for much fatter tubes as for aluminum, or some kind of structure a little bit more like a mixte.
you should use the quote function.
The current way of building mixtes is to drop the top tube and point it towards the rear dropouts, and then continue from the seat tube to the rear dropouts with an extra set of stays. This is because the full length mixte stays don't have as much stiffness and add the same weight. I think adding a second top tube angled towards the dropouts makes sense, and then add a second set of stays to keep that from breaking the seat tube. This makes a lot more sense than adding a tube parallel to the top tube, get some extra triangles from the weight. The French used to build large bikes with full-length mixte stays.