Originally Posted by
tomatsu
I had the same problem, a few teeth on a 41t were grazing my frame.
If needed, can you mount the chainring on the side closer to the arm?
That option will be on the table if I want to go bigger in the future, but it would move the chain out about 1/4" -- at that point, I'd need (or at least really want) to use a shorter bottom bracket to fix the chainline. Right now, mine's really good.