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  • will they by default sit further out than road cranks?

    Probably not. In those days, the wider chainline of MTB vs. road was generally achieved by use of a longer BB spindle, so the relation of the taper to the ring mounting face is much the same. You should get a wider Q than road cranks, but I'd be surprised if it was enough to solve your problem. You probably need something with Q>170mm

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