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everything seems fine, jockey wheels are correct and all installed/routed ok-except when I shift sometimes the derailleur seems to pull/hang inwards at at a very slight angle, as if it's only half completed the shift. I think this is because the chain is failing to mesh with the jockey wheel though, a sympton rather than the cause. If I over shift then shift back to the gear I want it seems to hang straight though. It's almost like it only half completes the shift sometimes.
jeff80
Got the right pulley wheels? Installed in the right location and orientation? Is the chain correctly routed through the derailleur? If you look at the derailleur from behind, is the pulley wheel correctly aligned with the chain/cassette cog? Is the derailleur hanger correctly aligned/not bent?