tune GumGum head tube expander for 1 1/8'  NEW

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  • GumGum Expander - 7 gram
    GumGum is the only part made out of silicone.


    It is used as expander in the fork shaft and saves the carbon face.
    With 7 gram it undercuts of course every standard expander. It fits in inner diameter from 24 to 25,5 millimeter.

    How it works? Put the GumGum with the nitrile rubber, the dividing plates and the screw plate together and put it in the shaft, tighten the screw, ready. Why it is so easy? As the silicone rubber gets pressed together when screwing down and then presses to the fork shaft and blocks. Quasi similar to a brake pad. Just in the same way you can remove it. Suitable for carbon fork shafts.

    Specs GumGum Expander

    • material: silicone, aluminium and nitrile rubber
    • head tube: 24 to 25,5 mm
    • weight: 7 g
    • functional principle: During adjustment of the headset the silicone rubber gets pressed together and therefore pressed towards the fork shaft. You can remove simply the GumGum during conversion.
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  • Attachements
    Manualinstruction manual
    187.86 KB
  • EAN/UPC
    Factory number:BSA0200
    Year2018
Problem free shipping to U.S.A.
Unproblematic customs clearance
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This item is crafted in Germany