Teknically speaking, if u get 2 bike models (1 each of single tube nd double dwn tube), hold the steering part in one hand and rest of d body in the other and give it a twist, a double dwn tube wud prove 2 b much stiffer nd wud budge d least, wen compared 2 d single tube model. Thats'll abt handling (influenced by rigidity) , wen confronted with torsional forces. As regards handling many other parameters play an important role. Pulsar has a dbl dwntube, ZMA single, but ZMA is the better of d two in handling. But put a CBZ (SDTube) thru some quick left-right turns nd u might notice it lacking in rigidity (even though CBZ is still s'posed 2 b the better handler of the two). So d +ve point of DDTube is rigidity, -ve is higher power 2 weight ratio. Vice-Versa 4 SDtube cradle. Handling characterisitics depends on the rest of the chasis, suspension design etc.
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