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  • XTR chainring BCD – a question for the detail oriented
  • rhayter
    Full Member

    I have a XTR 2x chainset with 38T and 26T rings. Shimano state that the BCD for “inner rings” is 64mm. Hypothetically – if I were old and fat – could I fit a 24T ring designed to run on the XTR 3x chainset?* Or am I missing something?

    Look here: http://bike.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/FC/EV-FC-M980-3086A_v1_m56577569830799250.pdf

    * I am old and fat.

    Posted 11 years ago
    shortcut
    Full Member

    Yes.

    Posted 11 years ago
    gmex619
    Free Member

    Depends if you have the extra spacing for the granny ring. SOME crans dont and need a little spacer to sit the chain ring out properly.

    Posted 11 years ago
    njee20
    Free Member

    Almost certain they’re fine without spacers, that was just the M970s.

    Try it. If the rings are too close get some m8 spacers.

    Posted 11 years ago
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