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Old 05-09-21, 03:07 PM
Andrew R Stewart 
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Join Date: Feb 2012
Location: Rochester, NY
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Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Raleigh Pro, Trek Cycle Cross, Mongoose tomac ATB, GT Bravado ATB, JCP Folder

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Some freewheels, SunTour Perfects as example, can rock on their pawls with each turn or the wheel. Most all freewheels have some slight bearing preload slop (and this is a decades long known good thing). When the chain contact is not over the pawls (like when in the higher gears. smaller cogs) a sideways force is acting on the freewheel's outer portion (of the core). The outer core and it's mounted cogs can rock with the pawls acting as the pivots. A knock/knock that is not usually loud and seemingly inconsistent (due to cog/chain combos needed and pedal pressure amount being rather independent of each other a pattern can be hard to discern) can happen. Shift a gear or shift on the seat and the noise can go away. Another rider on your bike might not induce the noise.

Lubing the freewheel interion can change this as does a different one. Andy
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