The signature of Ernesto Colnago, which appears as a decal on all new Colnago bicycles, except the special Ferrari versions.
From the late 1960s through the 1970s, Colnago was generally regarded as one of the builders of the world's best custom road race frames.
While Ernesto was the head mechanic of the Molteni team, riders raced on Colnago bikes. A win on a Colnago in the 1970 Milan-San Remo race for the Molteni team inspired Colnago to change his logo to the now-famous 'Asso di Fiori' or Ace of Clubs. After the demise of the Faema team, Eddie Merckx joined the Molteni team, and what ensued was mutual innovation—as Colnago describes it: "Merckx was an up and coming champion, and I was an up and coming bike builder. So it was a real honour to work for a great champion like Merckx. It helped us to grow... when we made special forks, and special bikes." This included the super-light steel frame used by Merckx in 1972 to break the world one hour record.
The mainstay of the Colnago line in the 1970s was the Super, followed by the Mexico, named in honor of the successful hour attempt. Other models were added including the Superissimo and Esa Mexico. While the finish on these early Colnagos could be variable, they were great riding bikes and developed a cult-like following.
In response to criticism that his frames were not stiff enough, next Colnago experimented with ways to change the behavior of frame components. In 1983, he introduced the Oval CX with an oval-shaped top tube to add stiffness. He then experimented with various crimped-tube frames which became production models as their top of the range frames, beginning with the "Master."
Since the 1980s, while Colnago continued to produce high-end steel bikes, they began to produce bike frames using material other than steel including titanium, aluminum, carbon and mixed material frames. One unique frame from this period, the Bititan, has a dual titanium down tube. Crimped and oversize tubes appeared on the Tecnos–one of the lightest production steel bikes produced, and the same oversize tubes and crimping were used on the aluminum Dream frame. I
Colnago's early attempts at carbon fiber frames were not commercially successful, but the lessons learned were embodied in their flagship frames, such as the C-40, the most sought after bicycle (1994), and its successor, the C-50 (2004)–respectively named for Colnago's 40th and 50th years in bike building. These carbon fiber frames set new standards of excellence. Interestingly, they were built using a modified form of traditional bike frame construction, substituting carbon fiber lugs for microinfusion cast steel, and carbon fiber "tubes" for the complex steel tubes used for steel frame construction. Similar building techniques are used in the latest offering, the C60, named (as before) for its year of production.