I have a problem. I just built up my bike with 2x9. When I have the chain on the smaller crank chainring,
it is rubbing the inner edge of the large chainring, but only at the entry and exit points of the
chainring. It would rub if the chain is on the last 2 rear cogs. It seems like the
crankset is bolted down too much. But it is not, even if I back off the crank bolt quite a bit, it still rubs.
What can I check? In the smallest rear cog, the two pulleys are aligned with the smallest cog.
Should I tighten or loosen the derailleur cable?
Please share your experience. thanks.