If we're talking hub motor, bafang already make those for 20" (406) wheels.
Or at least they have a model that come fitted to some new folding ebikes, not sure if that's available aftermarket.
@psg1ben started
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If we're talking hub motor, bafang already make those for 20" (406) wheels.
Or at least they have a model that come fitted to some new folding ebikes, not sure if that's available aftermarket.