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Originally Posted by Ken Robb
I would be worried that a triple derailer wouldn't like a 16 tooth gap between rings but I never tried it.
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+1
Ultegra and 105 9-speed triple front derailleurs don't like more than a 10T jump from middle to large (which is what it's being ask to do). Additionally the chainrings are now probably closer to the centerline of the bike.
From above information I'm not sure if we are talking about 9 or 10 speed. I thought 105s were 9-speed three years ago (but I may be wrong). In any case I'd try a new double front derailleur.