I just built up my second MCR. I shoud have never sold the first one. Anyway, I am running a 1x9 with a 34 tooth chainring on an LX crank with an external bottom bracket. On my first ride I got some major chainring rubbing on the chainstay when I hit a root at a bit of an angle. I am wondering if running the 34 tooth in the middle ring position should not be done and I should be running it where the big ring would normally go. I do have the bottom bracket set up correctly with one large spacer on the drive side and no spacer on the non drive side since it is a 73mm bottom bracket shell. My concern is that my chainline will be more sever when I need to get up in the 34 in back on a climb.
Has anyone else experienced this issue? I remember it happening on my last MCR as well. With full gear I weigh 180 and I am sure that makes some difference in the amount of flex I will get out of the chainstay and bottom bracket area.
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