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To be really really sure, in a desperate attempt, the bike has been tested with a different rear wheel and was driven with a different Bosch motor. Vibrating was still there. The bike is now sent back to Germany. Vibrating is most probably caused by a bad frame (because all other components can...

Changing the sprockets didn't make a difference... Unless the technical folkes at R&M can suggest another trick that should solve the vibrating, the bike will be sent back to the factory

In the meanwhile for the techies among us: http://ww2.gates.com/IF/facts/documents/Gf000379.pdf (see 2.4: chordal action) en http://chain-guide.com/basics/2-2-1-chordal-action.html

Unfortunately the vibration came back after a few days... My LBS got back in touch with R&M en they will now replace the sprockets. They believe the vibration comes from the sprockets that are probably to small. They will replace them with larger ones... PS: I'm no longer the only one with...

Got my bike back today and the vibration problem seems to be solved. I had a vibration free trip this afternoon. My LBS installed a new drop-out system and re-aligned the rear wheel. Apparently the rear wheel allignement needs to be spot on. In some cases a bad drop-out can make perfect...

My local bike shop was in contact with R-M Germany. According to R-M there are known problems with some dropout systems (the little metal things that hold your wheel and are connected to the frame - http://www.slowtwitch.com/Tech/Dropout_and_Hanger_101_3354.html). My shop has ordered the 2 new...

@gumster : I have the exact same vibrating issue as you discribe with my e-bike (r-m charger with nuvinci and gates belt drive). Had any luck yet solving the problem?