Originally Posted by
kevbo
you really need to put the camera on a tripod and get the bike to shake like that so we can see what's moving and what's not. If that motion is in the frame, it's broken.
here is his video for those following along at home:
The fact that you got it to vibrate is pretty interesting to me. I might have to try to replicate your experiment. I have a high speed camera that would probably make for an enlightening video. I also have a boss that rides 27" frames, so a test subject will not be hard to find.
In case I decide to do this, my understanding is that you are holding the handlebar up against a doorway and pulling on the saddle, is this correct?
My understanding of shimmy is that the actual cause is not really well understood, so it would be nice to have good video.