OK BianchGiirl, wake up and chime in.
I have this Bianchi in Columbus SL but which seems unusual to me so I hope I can get some background.
the basic triangle is 58cm ST x 57cm TT.
but they have added this odd 6cm extension on the ST and Steering Tube.
So for what size rider this was intended - a normal 58cm rider or a
really tall 62-64 cm rider who wants a smaller more rigid triangle?
can anyone shed light here? was this a fad at some point that faded?