Is it similar to this photo?
I don't know much about these. It could be the pedal itself or the pedal-crank arm threads, crank axle, bottom bracket threads, or chainring bolts. Maybe other readers will know.
You could oil the pedal pivots, oil the chainring bolts, and unscrew the pedals, grease, and reinstall. (remember, the left side pedal unscrews clockwise
, the right is counter-clockwise) Those are the easy fixes.
Does the noise go away if you unclip one foot and just pedal with the other?
Last edited by rm -rf; 08-02-10 at 07:32 AM.