I need some advice and/or ideas.
I just swapped out a Campy Chorus (aluminum) crankset on my Reynolds 853 LeMond for a Zipp 300 (CF) set and cannot tune out a small amount of chain rub in the 53-12 combo.
Here's the specifics: The Campy Chorus was a 108mm square taper BB. I'm using a 108mm American Classic ISIS BB with the Zipp. These are the correct size BBs. I'm using a Centaur FD (clamp on).
My LBS installed the Zipp (I didn't have the right BB tool) and told me about the rub. I went to the Park Tools site and was able to get rid of much but not all of the rub and am pretty certain that adjusting the FD is not the answer but I'm willing to listen.
I've noticed that there's a "bulge" on the inside of the outside arm of the FD. I assume that's to aid shifting but it's where I'm getting the rub.
The Zipp crank arm is thicker than the aluminum Chorus.
If I adjust the High screw anymore the cage rubs on the crank arm and I can't have that.
Are there any answers or am I a victim of the FD design and the "chunkiness" of a CF crank arm (and if I am are there other FDs I should look at?)