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gbj_tester
Interesting. The only thing I'm bothered about is that the chainring rubs the derailleur cage when out of the saddle. Looking down, I see the chainring is moving in and out relative to seat tube. I assumed this was the fairly cheap crank flexing as this doesn't happen on my other bike which has 105 ten speed.
Maybe it's something else causing this. Frame is a surly cross check so not exactly under built.