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TvH

Only thing I can think of is that the 9sp chain is too wide, but 6.6 to 5.8(?) doesn't sound like enough of a difference

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atk in reply to @TvH

Can't remember exactly but is the inner ring "ramped" around the bolts? I know the outer is and looks to be the right way round.

I ran 8 speed when I first used them before changing the rings and don't remember having that issue, maybe my chainstays were longer...

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TvH in reply to @atk

The teeth on the inner are biased towards the big ring the way I have it installed, but that's the way round that the bolts sit flush. Very odd

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