I have a sound coming from either my BB or mr rear hub. I am leaning toward the rear hub but I can't get it to make the noise when I am not on it. It is between a ticking and a knocking but more towards the knocking. Just started happening about two miles into my eight mile commute. The bike shop I normally go to is closed mondays. I did clean my drive train yesterday. The reason that I don't think that it is the BB is that it is much more pronounced and regular when I DON'T pedal. Could it be something with the freewheel.