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as u were. I took crank arm to be the crank itself. sorry.

I doubt that very much. If u check the bofeili motor, u will see its very different crankwise.

u dont give country? u may well have a rebranded bike from: https://longyeah.en.alibaba.com/ which use the bofeili motors, both hub and crank models. hope it helps, they may refer u to a source near u.