I'm stuck! Crank arm rubbing on the frame

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  • Hi there,

    I'm stuck here :(
    Trying to install a Sram Force AXS crankset (WIDE version) on my bike, with a 73mm crankcase.
    The manufacturer recommends to install a 3mm external spacer on the right side. However, when I Do that, the right crank-arm slightly rubs on the sidestay.
    I added a 1mm internal spacer on the right to move to arm farther but now its rubbing on the left.
    So I added a 1mm internal spacer on the left again, which was obviously a bad Idea...

    Any ideas ? I have 2 inner spacers and two outer ones (3mm and 4.5mm).
    Edit: important detail I guess. The frame is an older Titus custom made MTB, originally made for 2x or 3x cranks. Previously build with a Deore crankset, which worked fine


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  • Dumb thought but is the crank axle wide enough?
    My experience is limited to square taper cartridge or loose bearing arrangements and usually the cure is a slightly wider bb
    But I’m not sure this kind of approach is an approach for external cup type magic?
    Failing all that, crimp the stay
    Actually, don’t do that

  • It's supposed to be wide enough for a 73mm BB. However while typing my message I realized how dumb I am trying to build a 2000 MTB with a Road electronic groupset aha.
    I thought of crimping the stay but i'm pretty sure i'll resell the frame at some point and not sure about crimping Titatium.
    You're intuition seems right. I guess I would need a MTB specific crankset with a higher Q-factor

    PS: I love your nickname :D

  • Titatium

    I rather like the idea of a bike made from tatty tubes ;)
    It’s a description that works for all the bikes I own as well, so might have to get some stickers made up

  • Hahaha, perfectly sums up my bike collection as well in fact :D

    As far as my issue, after playing around with spacers and visiting some real mechanics, I actually need to either change cranks or crimp the stay.
    I'd rather crimp since the compatible cranks cost around 300pounds...

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I'm stuck! Crank arm rubbing on the frame

Posted by Avatar for BunkMoreland @BunkMoreland