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  • What is the principle stress in a hub shell, is it compressive or torsional?

    torque through the sprocket vs equal-and-opposite at the tyre, plus weight via the spokes... compressive is probably greater than torsional.

    Looking at Airlite hubs, I don't think there was anything but friction and spoke tension to limit relative rotation between the two flanges:
    http://www.classiclightweights.co.uk/airlites.html

  • If they're for rim brakes, there's no torque difference between the two flanges on a symmetrical front hub.

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