I was recently on the fitbikeco website and i was browsing the frame section and i stumbled across Tommy Dugan's frame. Its pretty nice and all but the "low profile wishbone" made me wonder. What are the advantages to it over the chainstay with the three tubes? I looked over on google but i couldnt find anything (nothing informative at least) which was weird because google has everything right? So what are the advantages to it over the other type of chainstay with the tubes welded together?