What is the reason for a longer head tube? To get the handlebars higher or does it make the bike handle differently?
I am not really talking about a comfort or endurance bike per say, something like a Pinarello Gan witch they say is less aggressive then a dogma.
As far as a bike being twitchy, does anything other then wheelbase have an effect on that. It was a long time ago but I remember I was in between sizes when I got my bike and I went with the smaller size. IF I went with the larger size the bike would have been a little less twitchy, so would that have the same effect as moving to a less extreme geomitry?