Old 04-10-18, 10:17 AM
  #3  
Tim_Iowa
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Join Date: Jun 2013
Location: Cedar Rapids, IA
Posts: 1,643

Bikes: 1997 Rivendell Road Standard 650b conversion (tourer), 1988 Schwinn Project KOM-10 (gravel/tour), 2013 Foundry Auger disc (CX/gravel), 2016 Cannondale Fat CAAD 2 (MTB/winter), 2011 Cannondale Flash 29er Lefty (trail MTB)

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Aaaah, you've encountered the MTB/Road incompatibility problem. Welcome to the support group.
@jsigone has it correct, the issue is the different cable pull between the MTB front derailleur and the Road front shifter. They aren't the same.

You probably can't replace the front derialleur with an cyclocross/road one, because the cyclocross/road front derailleur won't reach out far enough for the MTB chainline.

And you probably can't easily replace the crankset with a cyclocross/road one with a shorter spindle, because: the small ring may hit the chainstay, and the chain line will be wrong.

Solutions others have used:
1) JTEK Shiftmate 7 (Shiftmate Compatibility Charts and Choices - Jtek Engineering)
2) experiment with old MTB/Touring front derailleurs from the 80s, they may have the proper "road" cable pull but with enough reach for your chain line.
3) experiment with a modern road front derailleur and a shorter spindle
4) change out the left shifter to friction (bar-end, Gevenalle, stem, downtube, etc)
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