A timely topic on speed shimmy. As I said in my post of a couple of days ago (74 miles Around Lake Tahoe), I experienced THE SHIMMY for the first time and remembered the knee-to-top-tube trick. It worked. There seem to be as many ideas on this as there are ideas on this. I did have brand new tires and had recently changed the position of my saddle. Hmmmmm. At 43.3 mph, I really don't want to experience that again.
And oh, Red, didn't want to hijack the thread. You definitely made the right decision. What a mess that could have been from the middle of the pack. I like the idea of a new frame every year, too.
And by the way, our vacuum cleaner does the shimmy, too, albeit at a much slower speed.