Slabo,

Thanks for sharing your experience with the GY7, nice to see you racking up the miles quickly.

About the vibration.... that's the way they are. I rode Supersignets GY7 last spring and I couldn't get over how much it vibrated above 75kph. The dealer is correct, the bike is not geared correctly. Ninety percent of the bikes sold here do not have the correct gearing for their intended use. Play with the sprockets, they are a cheap easy fix to the problem. If there's enough space up front, try going up one tooth.

Enjoy your bike!

Cheers
ChinaV