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@Lanssi
I have a old XT (fc m7300) crankset, which I want to use on my beater. I read somewhere, that I get a 43,5mm chainline (which would be close enough for me) with a 110mm bb, but I think it was measured from the middle chainring, and I'd like to use the outer one. The original bb has a 122,5mm spindle, is it possible to just replace it with a shorter one? I've really used modern cassette mostly so far, but I'm not going to waste money on a bb with the wrong length axle.