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Okay, here's a puzzler:
I have a freewheel (a modern Sunrace unit) that works fine but sometimes (not all the time) makes a knocking sound during pedaling - it will start knocking after I've been riding in one gear for a few minutes and goes away if I backpedal for a few seconds. Shifting will generally, but not always, make the sound clear up temporarily. The pawls are engaging just fine, I can rule out both the hub and the chain as the source of the problem (both in good shape, and the same issue occurred when I had this freewheel on an entirely different bike), and none of the cogs are loose on the freewheel body. The only clue I can offer is that the knocking sound (and it produces a very small jolt that can be felt) varies according to the speed of the rear wheel.
Any guesses?
