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I have a sound problem and I can't pinpoint it. When I start to spin at high cadence, and particularly in my big ring, I start to hear this noise as I pedal. It's hard to describe, but I think it's almost like a clicking or rubbing sound as it's periodic and not constantly. It's hard to hear it at low rpms which makes it hard for me to find where it's coming from when off the bike. My best bet so far was one around one of the jockey wheels. I have no idea why it's doing this as I don't see any signs of rubbing material so i'm at a loss here.