Which XT 12-speed cranks on Mojo3- Mtbr.com
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  1. #1
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    Which XT 12-speed cranks on Mojo3

    I am upgrading my 2016 Mojo3 from an M8000 11-speed 2x setup to an M8100 12-speed 1x.

    I see there are 2 crank options, FC-M8120-1 or M8100-1. I am trying to figure out the best choice. I see Ibis specs the M8100, but I question the accuracy of the website to rely on it. Suggestions?

    FC-M8120-1

    - 178mm Q-Factor

    - 55mm chain line works with 148 O.L.D.

    - Prioritizes frame and tire clearance

    FC-M8100-1

    - 172mm Q-Factor

    - 52mm chain line works with 142 or 148 O.L.D.

    - Prioritizes narrowest possible Q factor

  2. #2
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    My Mojo has a Turbine 1x crankset. I'm pretty sure the chainline is 50mm. The upshot of a 50mm chainline is the largest chainring I can run is 32 tooth otherwise the teeth get too close to the chainstay. I think others have managed to fit a 34 tooth but the clearance is millimetres. However, as I spend a lot of time in low gears, the smaller chainline works better for me and I have no intention of fitting a larger chainring. Hope that helps.

  3. #3
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    Quote Originally Posted by End_User View Post
    I am upgrading my 2016 Mojo3 from an M8000 11-speed 2x setup to an M8100 12-speed 1x.

    I see there are 2 crank options, FC-M8120-1 or M8100-1. I am trying to figure out the best choice. I see Ibis specs the M8100, but I question the accuracy of the website to rely on it. Suggestions?

    FC-M8120-1

    - 178mm Q-Factor

    - 55mm chain line works with 148 O.L.D.

    - Prioritizes frame and tire clearance

    FC-M8100-1

    - 172mm Q-Factor

    - 52mm chain line works with 142 or 148 O.L.D.

    - Prioritizes narrowest possible Q factor
    I would choose the cranks that give you a 52 mm chain line every day of the week.

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