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http://www.instructables.com/id/motorize_a_bike/mikeyg wrote:Where'd you find instructions to make this?
http://www.instructables.com/id/How_to_ ... ke_and_Go/
http://www.instructables.com/id/How-to- ... per-motor/
Most people use stuff like that as guidelines, and use what they have available. Its not too hard, just takes some thinking and tinkering.