I had a stock Fuji Track for over a year, and then upgraded all the components considerably (Phil Wood, Campag cranks, etc.) at once.
The difference is enormous in terms of lack of creaks - the silence is brilliant when riding alone at night - and feel - handling is sharper and everything felt tighter. It doesn't feel that much faster, though, although I'm sure that all those little creaks, wobbles and bends used to suck up a little energy.
I had a stock Fuji Track for over a year, and then upgraded all the components considerably (Phil Wood, Campag cranks, etc.) at once.
The difference is enormous in terms of lack of creaks - the silence is brilliant when riding alone at night - and feel - handling is sharper and everything felt tighter. It doesn't feel that much faster, though, although I'm sure that all those little creaks, wobbles and bends used to suck up a little energy.