• Possibly stupid question here - running Campag Zonda C17 wheels, the rear keeps coming loose during rides, I can't seem to tighten the locking adequately as there is nothing to tighten against as it's reverse thread and the 5mm Allen key on the opposite side is not, so tightening one loosens the other.

    What am I doing wrong?

  • 5mm Allen and 17mm spanner on drive side lock onto each other like cup and cone setup.

    Drive side should have a preload come that is then fastened in place with a 2.5mm Allen once correct bearing pressure is set.

    Ignore the first video you see on Google. He has reassembled in the incorrect order. This may be your issue.

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