I posted this in the road bike forum will here to see about another question. I have an FSA mgeo expo carbon/light 39/53 crank on my Motobecane Immortal Spirit. It has dura ace brifters and shifts beautifully from big to small. In the big ring I get all 10 rear cogs although I avoid cross chaining but it can work in a pinch. I did notice in the small ring on the 12, and even a little on the 13 cog I get some chain rub on the chainring itself on the bottom as I it returns to the rear.
I realize this is cross chaining so I avoid this, but is this normal? From other responses some road bikes do this, I know my other bike with a compact crank does not so that is what I have to go on. Is this common and here is another question.
It has a 68mm bottom bracket english treads and I notice an Italian is 70mm. This might make things better but can I use and Italian BB with this bike. It seems the tread count is different and of course it is not reversed threaded?