Originally Posted by
klhada
I suppose fg would be more efficient in climbing (to me, it seens easier on hard climbs because of the moving cranks, wich make me suppose one do a bit less force to overcome the dead spots on pedal movement)
If you allow the flywheel effect of the fixed gear to push your pedals through the dead spots, then it's stealing that power from forward momentum of the bike. This is something that cannot happen with a freewheel.