Originally Posted by
sdimattia
This is what I decided on (more or less):
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Current gearing is Shimano Sora 50/34t and 11-32 rear. I'm planning to switch the rear cassette and derailleur for a 12sp Sram NX Eagle 11-50t cassette. ...
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I'd like to keep the Sora 165mm crankset if possible. ... In other words, can I use a 9sp Shimano crankset with a 11sp Sram front derailleur, 12sp rear mech, ....
So, if I read this correctly you want to use a 12 speed cassette which likely means a 12 speed chain and a 9 speed compact double crankset.
You might want to talk to some people that know this stuff better than most of the people commenting here, as according to Park you might have a chain getting stuck in between your chainrings.
Pasted:
The spacing between front rings for a 8 or 9 speed chainring set will be relatively wide. Using a narrow 10 or 11 speed chain may result in the tendency for it to fall between the two rings during a shift.
Pasted from:
https://www.parktool.com/blog/repair...-compatibility
I am running an 8 speed chain on 10 speed crankset on a couple bikes, I added spacers to move my chainrings further apart to compensate for that, but you plan to do the opposite, use a narrow chain on a crank that was designed for a wider chain.
You also if I read this correctly want to use a cassette that has a 39 tooth difference from big to small sprockets, and also a crank that has 16 tooth difference between big and small. I stopped trying to keep track of capabilities of the latest derailleurs for huge cassettes, so I have no clue if your proposed rear derailleur can handle that much chain.
In other words, I do not have the answers, but gave you a couple questions for you to be asking.