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I noticed that I get chain rub on FD at the power stroke. This is when the chain is on the largest front chainring and 1-2 outermost cogs.
Is it flex?
 

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Rub it............
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3,833 Posts
Yes its flex. Maybe a little bit of BB flex, but more than likely chain ring flex. My FSA Gossamer flexes a little bit when using the big ring and pushing hard up a hill.
 
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