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Replacing the Racing T derailleur with the Athena 11s derailleur fixed the issue. The racing T derailleur seams to don't work with the 35mm Campagnolo clamp. Or generally don't work with frames wider than 28mm.


The chainwheel does not sit at the correct chain line is the answer. The most common cause is that you have an axle length shorter/longer than the ideal chain line. In this case, you have a shorter axle length. Did you add another chainring into your crankset? If the answer is yes, you will need to tweak around: either adding spacer (not recommended) or ...

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