Thanks, learned alot. Especially the weight factor, too much in the back and it would make for an unbalanced bike. Also, the post about creating a wedge (carbobfiberboy) was excellent. As a competitive runner and biker,I can attest to drafting being an important tactic. Well, I'm off to buy a tandem, then all I need is a partner, or stroker, or captain, or ?? whatever, :-).