Being an old guy, we're just looking for a way to extend our range ...we like pedaling...and a way to take those short trips (12 mi) without starting up ye olde fuel burner ...Thinking Green/Exercise...15mph would be plenty of speed for me...I just want a simple system that wouldn't break the bank ... We bought a 300Watt scooter motor with built in controller and thumb throttle ...just need a way to hook it up...??? In the crank area seems perfect , but we don't have a clue about those freewheeling pedals/bottom bracket... More info for Dummies , Please...!!!!