Background: A couple years back I built a chopper with a 26" front wheel and a 12" rear wheel. It was a lot of fun, but I had to pedal like mad to get anywhere. Unfortunately I could not find a rear cog small enough or a front cog large enough to get me somewhere useable on long rides and ultimately had to increase the wheel size to 16". The size increase worked out great, but I want to try to build a new chopper with a 12" (if not 8").
Are there cogs small/large enough out there to make this work?
My other thought was to weld a bottom bracket shell to my seat post with a multi-speed chain ring and chain one sprocket to the front and the other to the rear. Would this work? If it would and this seems like the right way to go, what sprocket would need to be connected to what sprocket?