I built this electric bike for commuting to work. I stretched the rear triangle section partly because I wanted the extra cargo room and partly because I just liked the look. :-)
Step 1: Cutting and Welding
I started with a few curbside-recycling bikes which I welded together to make a stretched frame. I used a simple jig (made from parts of an old exercise bike) to try to keep things mostly straight ;-)
Step 2: Testing the Hub Motor
This show the initial testing of the hub motor and controller. I'm using a 20Ah 48V LiFePO4 battery, which is not shown in this photo. The hub motor, controller and battery were all purchased on EBAY.
Step 3: Rolling Chassis
Note the 2 kickstands. I need both due to the stretched frame and the battery weight.
Step 4: Final Touches
I'm happy with the performance of the bike. I can sustain 25 MPH with moderate pedaling and I can easily commute the 15 miles (each way) to work and the battery still has reserve charge when I return home. I installed a DC-to-DC converter (from an RC Hobby supplier) to generate 6 Volts to run the headlight and tail-light so all the electrics on the bike run from the 48V battery.
Participated in the
Earthjustice United States of Efficiency Contest