Hey rEd, I've read that double cradle frames are better than single downtubes as far as the stiffness and rigidity are concerned. But I don't want to sound like a typical Pulsar guy yet again and state something like "yes, double cradle frame is much better than single downtube. That's why Pulsar has it and most others dont!". Just kidding!
As Ricci said, if even modern foreign bikes can use single downtubes with the engine as a stressed member, both configurations should have their own plus and minus points. Waiting for a real tech guy to put down all the points though! - MAX.
