Clicking noise when pedaling

[laura*]

Another possibility is a loose chainring. It could be sliding back and forth on a chainring bolt. Under load, it would always move at the same crank position. Without load (i.e. when you pedal backwards) it might not move at all - hence no clicking.

[zoom-zoom]

The bad bearing thing is something I've run into. And the weird thing with that one is that it's often not rhythmic, so it can really make you nuts trying to figure it out when it's random and difficult to pinpoint, since the sound seems to come from everywhere in the bike.

[DebW]

If it might be the pedals, easy way to test is to put on a different pair of pedals, maybe borrow from a friend.