Originally Posted by
twocicle
In this era of awesome handling 900gm lightweight single frames, it is surprising that we can still have 2kg extra weight for a tandem and call these lightweight frames. Besides being a bit more sturdy, the typical no-lateral tandem frame has 1 more seat tube, 1 more BB shell, and 2 rear connector tubes (TT & BT). Not trying to be naive, but does this really need to add +2kg?!
One reason for not seeing really light tandem frames might be product liability. If a manufacturer builds a frame how does he know how it will be used and what the team weight will be? If you built your own tubes and your own frame then you could build it for the intended use and the actual team weight. And then never sell it to anyone who would exceed that intended weight.