Bike sizing is not an exact science and most of the variables, i.e. saddle height, handlebar position etc., can be modified by adjustment so the size of the frame isn't crucial. That said, some people will tell you it is, hence the availability of custom frames.
The difference between Giant and Colnago's approach is that Giant are competing on price so the fewer sizes they make the less their manufacturing costs are whereas Colnago are selling a premium product so tailoring the size to the customer suits their approach.
Oh I see so if you have a normal bod you can save a bit of money by buying the Giant or Look or what have you but if you have monkey arms or fat girls legs you can go with the Colnago to get something to better fit - this discussion is really showing me the importance of getting properly fitted up , thanks
Oh I see so if you have a normal bod you can save a bit of money by buying the Giant or Look or what have you but if you have monkey arms or fat girls legs you can go with the Colnago to get something to better fit - this discussion is really showing me the importance of getting properly fitted up , thanks