Originally Posted by
stapfam
Mine was cabling. Outer cable on any movement of the bars and two cables touching caused a click--And the other was the extra cable on the front derailler catching on the shoe as I pedalled.(But that was only one click per revolution) Shortened the excess and fine.
This is the most frequent source of "phantom" clicking. If you have any cable ends or other bits on the bike that can contact the frame, the sound can be "telegraphed" through the frame. Sound can be annoying, transient, relatively easy to spot - and easy to overlook as you concentrate on big, complicated areas like pedals, headsets and bottom brackets.