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Old 07-09-13, 06:28 PM
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Join Date: Apr 2009
Location: New Rochelle, NY
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Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

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A photo of the right side of your bike taken from the back would help, but I suspect that it's related to something close to and above the cassette. On some bikes the inside bottom of the seatstay, where it joins the dropout is the problem. The chain on the outer sprocket tucks under it and runs fine, but can get snagged during a shift when it has't fully engaged the sprocket.

The same can happen with a fender screw that comes through the eye and sticks out near the cassette.

Look from the back, and see if there's anything inboard of the dropout face that may be the issue.
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