• 08-24-2019
    End_User
    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
  • 08-25-2019
    Rhialto
    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.
  • 08-27-2019
    Crossmaxx
    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.