I don't read the forum that often, so maybe this has been previously discussed. I have a 1974 Raleigh Sports that I absolutely love. Lately, it has devoloped a "chirping sound" that seems to be originating from the bottom bracket. I'm basing this on the fact that I only hear it when I pedal and the bottom bracket is where the sound seems to be coming from. The sound isn't extremely loud, but it's definitely noticable. I've checked the pedals and no such sound from there. Anyone familiar with this symptom and what, if anything, I should do about it? Is it time for a bottom bracket overhaul?