Not at all cogs, basically because it doesn't use a standard bike frame since the unit completely replaces the bottom bracket and all lower tube end parts.
The frames on the bikes using these have a curved metal channel joining to the down tube, seat tube and rear frame tubes, the motor unit bolting into the metal channel at three points.
In addition the battery is integral so has to have the appropriate space behind the seat tube, not available on normal bike frames.
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