Old 09-03-12, 10:52 AM
  #8  
gmt13
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Join Date: May 2011
Location: Durham, NC
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Bikes: 69 Hercules, 73 Raleigh Sports, 74 Raliegh Competition, 78 Nishiki Professional, 79 Nishiki International, 83 Colnago Super, 83 Viner Junior

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I'm gonna guess that it's the freewheel. Some of them have enough play to knock a bit. It is always intermittent. Next time it happens, try spinning the cranks backward one revolution - see it it stops.

This is a common problem on the SS BMX type freewheels.

-G
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