Cannondale 2010 making erratic noise when pedaling
Cannondale 2010 Road Tandem 3 with Tiagra shifters and 200 miles on it. Something is making an irregular taping or banging noise when pedaling. It seems it's making more of a noise when pressing hard on the pedals, it's almost as if the frame is flexing and something then is making noise. It's coming from the drivetrain and I don't think it's coming from the Captain's bb. I haven't ridden it as a stoker and the person I ride with may not be capable of determining the location of the noise. Any suggestions?