Join Date: Dec 2010
Location: Above ground, Walnut Creek, Ca
Bikes: 7⃥ 9 road bikes
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often after backpedaling a freewheel will use a different pawl/tooth combination when reengaged. a noise, most likely from poorly aligned pawls and teeth in the freewheel, will create this rhythmic noise. coasting will temporarily stop the noise if a "good" combo results. it's hit or miss.
fix is to buy a different freewheel. i have recently been purchasing what i think is a nice compromise between, price, availability, and quality. it's the ACS Crossfire model.