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Its almost always a good idea to go with a higher voltage. If I were doing a bike I would definitely go 72V or higher. Its just more efficient, and easier on the batteries (less amps).
Most of the DIY conversions use brushed DC motors. There isn't anything wrong with them at all. Their efficiency is not much worse than brushless motors, especially the permanent magnet brushed DC motors.
Sorry, I can't answer the current question. Suffice to say AC current and DC current are different.
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