Originally Posted by
Kontact
Cranks and spindles are built to produce a chainline, not match a derailleur. The derailleurs are also built to go to a chainline, not for a particular crank.
If anything, your bike is a road bike and the crank is an MTB crank, so it may be further out rather than further in. Did you get a BB for a 68mm shell or a 73mm?
And 3.5mm is a fair amount for crank chainline. But there could always be a problem with your derailleur, too.
I did get a 68 mm BB, matching my frame. Oddly, I can assure you that the crank is definitely farther inboard than the stock FSA Vero triple was.
Originally Posted by
hermanchauw
Sora is road series. M371 is mountain series. Won't match. Get a mountain fd. You didn't say what shifter you have also, but it should be a road one to shift a road fd and vice versa. On the other hand, there are hacks around to make one work with the other.
Most resources I found asserted that 9 sp groups were pretty much all inter-compatible, ever between mountain and road.
Anyways, I know I'm frankensteining stuff a bit around here, but that's what you have to do these days to get a granny ring with brifters. I guess I'll just go ahead and try it out, based Kontact's a comment that 3.5 mm is "a fair amount", and my own intuition.