Downhill fear

[Ritamarie]

try keeping one knee on the top tube, or clamp it between both knees, to keep the bike from shimmying.
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Isn't something wrong with your bike if it is shimmying? I've regularly gone over 40 mph downhill on my road bike and have never had it shimmy. I'm not super brave on downhills either, mostly because I am afraid of wildlife running out around here (I almost got run over by a deer the other day!) or I imagine blowing a tire mid-descent, but I never worry about losing control of my bike due to it behaving unpredictably. I save that worry for when I'm on my horse.