Originally Posted by
Bike Gremlin
The first thing I would check is the FD cage alignment and height.
Fixing that might solve the problem.
The next thing I'd check is the
chainline.
Also, to avoid misunderstanding:
Does the large front ring combined with smallest two rear chainrings (the ones most outward, away from the bike) cause rubbing?
Because, if it's the largest front ring with the largest two rear chainrings (the "slowest" gears, closest to the frame), then we're probably dealing with cross-chaining and some chain rub might be inevitable, depending on your chainstay length (which is ridiculously short on most modern bikes).
Relja
From the Original post... "Because of this, I needed to replace the OEM SRAM Apex front derailleur with a Microshift derailleur."
Pull ratio issue, since Microshift uses it's own pull ratios for the Advent/AdventX series, and SRAM shifters don't play well with others, anyway........ coupled with a Chaincage that's WAY too high in the back... yep.. needs a different Der., and/or the stock SRAM Apex back on, and a reverser pulley (best choice).
this came about because a frame builder re-routed the Ft. der. cable along the top tube, and a shop got too creative......