Well, that motor simulator seems to be for hub motors only. When I click on display the whole motor window goes blank (?).

Gearing for the MY1018 for crank cadence seems to be 12T X 46T for the GNG mid-drive kits using the similar MY1016. I should be okay if I can find a 12T 11mm bore 4mm keyway freewheel (I know they exist, but I can't find one) and a 46-48T chainring at the crank giving 88rpm using 80% of the stated 440rpm. I'd much rather use the supplied fixed 9T that comes with the motor and some kind of special freewheel only on the crank to motor chainring using a 36T for the same 4x additional reduction, but can't come up with an easy solution for adding an outside chainring freewheel only, while keeping the inside chainring fixed to the crank. I'd prefer to keep the Race Face Aeffect SL crankset that's in place now.

If I want to drag the chain to the motor while pedalling without power 90% of the time, all I need is a 12T freewheel for the motor shaft. I can use a dual 64BCD/104BCD cinch spider for the two chinrings on the crank.

Does anyone know where I can buy a 12T freewheel with 11mm bore and 4mm keyway for a MY1018?