I'm considering getting wild with my aluminum commuter bike and removing the downtube and replacing it with a cable. I've on seen this one the Slingshot Bicycles but they turn it into some sort of funky suspension thing. My thinking is that the downtube is only in tension (unless you're crashing into something) so why not replace it with a cable to save weight (my bike has an oversized downtube). Will this really save me any weight? Could this cause my top tube to torsion as I pedal, and subsequently cause my bottom bracket to "wag"? I would appreciate any advice on this and also possibly some where to find some other examples. I sure someone else has tried this.
here is slingshots website.