Question about Dahon 7 Speed Folding Bike

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Handlebars loose I have a Dahon Vitesse, the handlebars are wobbly and when I tighten the allen key bits under the handlebars it either becomes too tight to clip in or clips in but continues to wobble.  If the handlebars are folded down its the bit underneath that causes the problem - the bit with 2 allen key holes in 2 screws. I have also tightened the allen key on the clip itself but this didnt help.

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Construct shims from aluminum (soda / cola) cans with scissors. Be careful not to cut yourself, sheared aluminum is very sharp. After you have cut a wide strip of aluminum, wrap it around the handlebar and put it between the handlebar and the clamps. This will increase the diameter of the handlebar and allow your clips to exert more pressure on the handlebars making them tighter. Try not to leave any aluminum exposed after fixing it; it's sharp.

Posted on Jun 16, 2009

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Break_2_fix seems to be addressing a different question. The original question is about the "wobble" at the handlebar fold joint. The question has nothing to do with the diameter of the handlebar.

Posted on Jun 27, 2010

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  • gdaeman Jun 27, 2010

    Short-term Fix: Building off the shim concept of break_2_fix, consider the following (it's working for me):

    Material: Get some heavy foil, just a little 3 x 3 square is fine... heavier the better, within reason.

    General Concept: Create a foil shim to mold over the locking mechanism to make it have a tighter lock. Warning: This is a bit crude, so use some good judgment in adopting this solution.

    Tools: scissors.

    Setting: Observe the part of the hinge attached to the bike frame. In the center is a silver metal
    pad that has the allen wrench screws on top and on one edge. This is the pad that moves to lock
    the handle bar. The part of the pad that is arch-shaped has a lip on
    it. That lip slips into a grove on the part of the hinge attached to the
    handelbars when locking.

    Process: Cut a 3" x 3" square of foil. Lightly press the foil over the "pad" referenced above to create an impression of the nearly square-shaped pad (square-shaped except for the arch along one edge).

    Use the scissors to trim the foil to within about 1/8-1/4-inch of the outline of the pad that is now molded into the foil.

    Carefully mold the remaining foil over the pad. Fold it down firmly on all edges taking particular care to fold under the part on the arched lip of the pad.

    Extra: You can use a blade of the scissors to carefully cut little half-moon slits in the two holes on top of the pad where the allen wrench screws are; carefully fold the edges of foil, at the slits, down into the holes to improve the foil's grip to the pad (I considered glue, but.. doesn't seem necessary).

    Trial: Carefully lock the handlebars into place. If it seems too tight, don't force it. If too loose, you could try two layers of foil or other refinements.

    My outcome seems to be just right. Locking it into place seemed, if anything, to make the foil better molded to the locking pad mechanism.

    Good Luck

  • gdaeman Jun 27, 2010

    Minor errata in last post: The locking "pad," with allen key screws, is on the handlebar-side of the hinge.

  • EEyin Apr 26, 2011

    I have a vittesse and a dahon speed, the handlebars loosen all the time but I carry a 8mmm spanner. the single nut needs tightened towards the white nylon bush. dont touch the 2 allen screws on the flat plate.



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