Around the end of middle school, my friend Luke Plummer and I decided to put an old bike and weed-whacker engine to good use. We went through two design iterations after realizing the gear ratio needed to be much more extreme than a normal bike.
This was one of my first experiences welding (with a torch). The bike works fine but it doesn't go very fast or up hills.
Coming soon: There is video footage, but I haven't embedded it here yet. Stay tuned.