Folks - I am seeking some advice here. I have begun riding a new bike (Calfee Dragonfly) and am experiencing something I have never had before. That is, when I am coasting, and particularly descending long hills, I hear this god-awful noise and often times, soon after the noise appears, my chain drops off the chainwheel  . In all cases, it only happens when I am not pedaling at all. Now, the noise sounds like some type of vibration, but so far I cannot pinpoint it. And, I am assuming it is somewhere in the drivechain - but realize it could be anywhere. However, I am curious as to what is making the chain come off the chainwheel. (It happens on large and small - I have a Stronglight Pulsion 50-34 compact.) I am often reaching quite high speeds on the long descents in hilly/mountainous areas and this noise / chanin drop is not all too pleasant to be hearing. Any ideas on what may be causing it and how to eliminate it? Thanks.
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Strange Noise - and Dropping Chain
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