Originally Posted by
Pompiere
It depends on how much the frame flexes when you are really hammering on the pedals. You could put a spacer between the bottom bracket fixed cup and the frame to move it out a mm, or if it doesn't mess up the chain line, you could put the chain ring on the outside of the crank arm.
I had to put the chain line on the outside of the arm for one of my conversions, never had a problem with it even though the chain line wasn't perfect. It was good enough for around town.