• The Sturmy Archer and Shimano freewheel i have are 10mm thread depth, and 16-18mm overall thickness.
    The Fixed sprockets i have are 6mm thread depth, and around 6.9mm overall thickness.
    Your ruler is out if thats the same :)

  • So the 6mm of thread on your fixed sprocket will engage with x cm of thread on your hub. x must be <6mm and the full length of thread on your hub to facilitate it working correctly.

    Screw on your 10mm thread depth freewheel on to the same hub, thread engagement will still be x cm.

    No ruler required.

  • Your logic is out.

    The female thread could be 2 metres long, it’ll still engage the same amount of the male thread.

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