hmm, now that I think of it, my carbon-forked bike makes a very different sound then my steel-forked bike when going over big bumps like potholes that I don't see or train tracks. the carbon-forked bike is sort of a thud-clink sort of sound, the steel bike is like a boing/bell resonating sound. The carbon fork makes a softer noise. I think that the clink is one of my cables hitting the frame, but I can't be sure.