Join Date: Jan 2008
Location: Beaverton, OR
Bikes: Kona Jake, Kona Jake the Snake, Kona Major Jake, Kona Kula, Ridley Excalibur, LeMond Buenos Aires, Pinarello Gran Turismo, Pinarello Montello, Trek 614, Austro-Daimler Team, Motobecane Grand Record, Schwinn Voyageur, Nishiki Olympic, Steyr Clubman
Mentioned: 42 Post(s)
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Typically when your bike is heavy it's because your parts are heavy. A really heavy frame typically weighs no more than 4.5 pounds. All but the very lightest frames weigh over 2.5 pounds. A steel fork might weigh as much as 2 pounds, and a full carbon fork will generally be just under 1 pound. So going from really heavy to really light in the frameset might save you 3 pounds. That's nothing to sneeze at, but you have to decide for yourself if it's worthwhile. Also, I think you've already got a carbon fork, and I'd be surprised if that frame weighs over 4 pounds. You probably would be saving less than 2 pounds.
That Colnago frameset won't work with disc brakes, so that's probably a consideration for you. Most carbon framesets these days will have some kind of oversized bottom bracket and head tube, so those are additional parts you'd need.
Making a bike lighter is always a very expensive project, and it's not done until you've replaced everything.