I just about lost it at 46mph on Carson Pass this past weekend due to speed wobble. The bike is fine. Everything is true, tight, and good.
It was an issue of harmonic oscillation. I'm tall, the bike had a long wheelbase, etc. Perfect conditions for it.
I didn't know about the knees on the top tube trick, so I consider myself lucky to have not lost a lot of skin.
Just read up about speed wobble on wikipedia. You can even watch a video of a guy inducing it and correcting it on youtube. It's no longer scary.
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