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The 500W motor is much better. Much more responsive and has more torque. If I ride conservatively then the battery seems to give me about the same range as the old motor did but if I push it then the range reduces a lot. But this is to be expected!

I had a Bionx 350W system and the motor failed. I bought a 500W motor and swapped it with the old one and it worked without any other modifications.

That article about roller chain drives and it's discussion about "chordal action" is very interesting and seems to support my theory that the "thrumming" is a function of a small chainwheel rotating at 2.5 times the crank rotation. My Delight has now clocked up 5500 km and I have got used to and...

I have a Delight with the 11 speed derailleur and I also get that annoying vibration/thrumming feeling. I have a theory that this is possibly caused by the fact that the chain wheel is small and rotates at 2.5 times the pedaling cadence. This vibration seems to occur mainly at higher cadences...