Road Nazi Hunter
Join Date: Jul 2007
Location: Slow! But Ahead of You.
Bikes: Kuota Kredo, Litespeed Vortex, Aegis Victory, Burley Tandem, Cannondale Rush
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I run a Campy Record 10 on a carbon frame and worked out any noise myself. Sometimes a carbon frame amplifies any little drivetrain noise.
First, to check the front derailleur, ride in a flat open area, put it in the gear in question and apply real pressure to the pedals. Watch the crank to see if it flexes in the frame at all. Sometimes, if your frame is not super stiff, the frame will flex enough to allow the chain to rub on the fornt derailleur when under pressure. If this is the case, make sure your bottom bracket is tight enough, if it is the flex is in the frame but there is nothing you can do about it. Center the front derailleur over where the chain is running to avoid this.
If it could be rear like mine was, I put the bike in a stand, shifted into the noisy gear, dead center. I scrutinized the position of the chain out of the derailleur to the gear. Is the chain sitting dead center on the cog or is it on one side or the other? Play with your barrel adjuster just a bit to center it and see if that does not shut it up.