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@vinylvillain
"The Colnago Concept was a radical new idea that failed largely because it was too heavy. The bike was developed with help from Enzo Ferrari. Its various innovations included three spoke carbon wheels, hydraulic brakes, and of course the transmission. The transmission was contained just below the teeth of the chain ring. "The transmission was enclosed in a light alloy chain guard shaped to fit closely around the chain rings. From the outside the chain guard didn't rotate at the same speed as the pedal spindle as the gear ratios were obtained from a series of smaller cogs contained within the chain guard."