Old Shimano XT crank -> ~42mm chaninline

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  • 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.

  • What chainline do you need for your hub and sprocket?

    Measure what chain line your current bb gives you on the outer ring. Compare how that differs from what you need, and use this difference to work out what spindle length bb you actually need.

  • 42mm would be perfect, would settle for a 1-2mm offset. Yeah I know I should just do that, but I'm too lazy and just wondered if anyone had an answer right away. :)

  • Ha! You might be able to work it out by just fitting the crank to the bb without installing the bb first.

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Old Shimano XT crank -> ~42mm chaninline

Posted by Avatar for Lanssi @Lanssi

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