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pifko
ffm
What's the most likely cause of fixed-gear drive train noise that only occurs under moving load? It's not a creak from standing on the pedals while the bike's stationary and it's quiet while just gently rolling, but as soon as I put any power down, in any part of the pedal stroke, it gets very noisy.
EDIT: The chain is new and I've tried it with 2 new chainrings that are new and (apparently) NOS. The chain that I used with the old sprocket was worn, but the sprocket looks fine.