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I recently retro-fitted a Bafang mid drive kit to my tandem trike. Only had three hilly rides so far but it has been excellent so far. We are only using it on hills and long tiresome drags but it is a great help. The motor, controls and battery cost around £900.00. I had to buy a chainsett for the through drive as the old one didnt fit a square taper bottom bracket.
Sorry, Picture upside down!