Tom Stanton developed a 3d printable system that converts a regular bicycle into an electric powered one. Biggest 3d printed parts are the motor mount and wheel pulley system.
He modified the "Vilano Rampage" fixed gear fixie single speed road bike. The motor used this project is the Turnigy Aerodrive SK3 - 6374-149kv brushless outrunner motor with 6s 5000mah li-po battery.
Here is the Q&A video about the bike electrification:
All the project files, BOM and instructions can be found at: