I wonder if the vibration you felt was what people refer to as "speed wobble" or "shimmy". Some references to it:
I would have your LBS rule out any equipment problem, but it appears that the wobble can happen on any bike. Luckily, I have never felt it. From the articles, some things that appear to help: unweighting the saddle, perhaps by standing on the pedals, pressing a knee against the top tube, keep the cranks horizontal and not vertical if you are coasting down, not having a 'death grip' on the handlebar.



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