Expander Bung

simz720
simz720 Posts: 17
edited January 2012 in Workshop
Hi guys, I've ordered an expander bung for my bike. I've been trying to test it, but it doesn't seem to be expanding enough to fill my steerer, Im not sure wether I using the correct bolts, theres 2 but one is underneath the other. And is there any technique involved in using a bung.

I have an mpart components expander bung
http://www.chainreactioncycles.com/Mode ... elID=19009
It is the exact one in the link above. :?:

Comments

  • sungod
    sungod Posts: 17,413
    not used that particular one, but typically...

    remove the top cap and bolt

    inside the upper part of the bung, is there a recess for a hex key?

    if so, that's what you use to expand it inside the steerer, once it's tight you put on the cap and screw in the bolt just enough to load the bearings

    the bung should be positioned so that it covers the full length of the steerer that will be exposed to the stem clamp

    if there's a flange at the top, this should rest on the top of the steerer tube, no gap, it may be you need to add a short spacer, 3-5mm, above the stem to prevent the cap fouling on the top of the bung
    my bike - faster than god's and twice as shiny
  • napoleond
    napoleond Posts: 5,992
    I just googled expander bung. I'm glad the kids weren't about. :shock:
    Insta: ATEnduranceCoaching
    ABCC Cycling Coach
  • simz720
    simz720 Posts: 17
    hahaha my goodness the results google gives these days. Well it actually turns out I was installing the bung correctly but the manufacture had put the bottom bolt on the wrong way round, switched it over and now its expanding properly :P

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