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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.
@abr @Pifko You were both on the money with this. My back sprocket was really pretty worn, it wasn't obvious until I cleaned it up, but the back face of every tooth was concave. I put a new sprocket on and it's whisper-quiet again.
Thanks.
ffm
Most likely and cheapest to replace is a worn out sprocket.