Old 07-09-09, 10:22 AM
  #2  
dschwarz
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Join Date: Jul 2008
Location: New York City
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Bikes: 2006 Dahon D7, 2015 Kona Minute

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Soseono,

First things first, have you tried tightening up the QR using the thumbscrew to prevent rotation when the handlebar is dropped to the maximum? You should be able to get it REALLY tight.

If that doesn't work, I suggest bringing your bike to the LBS and have them trim down the steerer tube (this is what I'm calling the vertical tube that the stem clamps to, not sure if it's the right terminology.. you are calling it an extension tube, I think) I did this and they cut mine down quickly and cheaply using a seatpost cutter.

I replaced my stem and steerer tube completely. 1" OD 7/8" ID 6061T6 aluminum tube from aircraftspruce.com is just the thing you need. With a shim it fit a 1 1/8" stem perfectly, and the top cap from the stem fit right on the top of the tube. I will post a picture if you like.
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