Bike Forums - View Single Post - Brand new eTap group; *one* cog doesn't shift
Old 03-05-18, 06:23 PM
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Marcus_Ti 
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Originally Posted by Iride01 View Post
Maybe a particular area the various joints the derailleur articulate on is a little rough, dirty or otherwise binds in such a way that it doesn't move freely at that point.

Can it be moved by hand so you can assess that? Or maybe take the chain off and see if you get an equal amount of travel from each shift and equal response time.
Check documentation before doing this.

IIRC Di2 documentation strongly advises against ever manually moving a Di2 derailleur's parallelogram.
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