No chain line issues, no rubbing, though there is some noise from chain deflection when running the lowest gear. I had run a double on the front, but switched back to a single with a 53 tooth ring. Everything was bolt-on, no modifications were necessary. The Dura Ace 7800 does not have enough Q factor to run a front derailleur on my particular frame, so it needed to be moved out a bit. I found the extra chain ring and components to be redundant, so I returned it to a 1x11 drive line, and am happy with it.