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Old 07-25-15 | 06:12 PM
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Homebrew01
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Joined: Jul 2004
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From: Ffld Cnty Connecticut

Bikes: Old Steelies I made, Old Cannondales

It happens when you are in a gear in which the chainline is "off". The chain is auto shifting to to a central cog that better lines up with the chainring. If you are in a middle cog, it won't happen.
They all do that.
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Last edited by Homebrew01; 07-25-15 at 06:22 PM.
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