Twin downtube bikes exist!

Twin top tube bikes aren't very common anymore, but they certainly exist. A good example are a generation of BMX bikes in the 80's. The twin top tubes gave the bikes added stiffness and allowed the rider to stand on top of the two tubes for tricks.


The other bike that had twin top tubes were Mixtes. The Mixte design began as a bike that could be used both by men and women. The low top tube allowed the ladies to wear skirts and still pedal the bike, but the bike was still stiff and handled well.


Now on to the downtube twins. They are rare, but examples exist. The most popular examples Were designed by Ernesto Colnago, the Bitubo, Titanio, and the Bi-Titan. These were designed to make the frame stiffer.


There were other bikes with twin top tubes, as can be seen in the photo below:



So it can be done. All I need now is a framebuilder crazy enough to try. :)