Just on the off chance someone here has had a similar problem.

Was driving home yesterday enjoying the beautiful weather on a pretty empty road (ie. I was going pretty fast) when suddenly my bike started doing an new kind of vibration. My passenger said she had noticed it to a lesser extent on the ride out. I didnt, I thought it started suddenly. Maybe it started in the back... I dunno.

Anyway this vibration has a lower frequency than the engine vibrations. Feels like you driving on the broken lines at the side of the road, or like a wheel is kinked or loose. So far I have taken it to three mechanics and they all tell me it's fine. They can't feel anything. They try all the basic shit and give up ie. lube chain, tighten wheels..." sorry can't help. When it finally does give in tho, and your bike is really f*cked, come back and we can help you"

Has anyone had this problem or know any real mechanics in Shanghai (I keep getting sent to the shop where I bought the bike but that lot are a right waste of overalls too).