Old 06-04-21, 07:16 PM
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Join Date: Jan 2009
Location: SF Peninsula
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Bikes: 1986 Centurion Ironman, 1997 Trek 2120, Trek T1000

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A friend had something similar, and the problem was the chain routing through the rear derailleur. It was in the wrong side of a metal tab, and each link had to slide over it.

​​​​​​THis seems like a large enough error that it would be obvious, but it isn't. He had taken it for 1-2 mile shakedown rides and the extra drag wasn't so much scream. "wrong wrong", just enough to be noisy.

Something to check...
tgot is offline