While riding my right knee sometimes makes a clicking noise on the down stroke. It is worse while pushing myself up hills, but can happen on flats as well. It seems to last the first mile or two of my commute and then stops. There is no pain associated with the clicking.. It is just very annoying, and has me concerned that I'm potentially causing damage to myself.
I am riding clipless, so am thinking that my cleat angle may be wrong, but I am perfectly comfortable while riding. Just click, click, click, click...