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@Sparky
I think bikes have a sort of resonant frequency. I used to love rolling down this big hill near me on my hybrid - on a bike lane, hands off the bars. I used to pick up loads of speed and there was always a patch halfway down where the bars started shaking side to side really violently. A couple mph more and it stopped dead. Always the same speed.
It scared me the first few times, but I realised that I didn't even need to touch the bars, it would just die off. Your results may vary...