Moped Army

Oh my freaking god it's not just a Redline, it's a RAIN CITY!

Belt pedal drive? Also, you have, what, some kind of super-wide hub that let you fit an extra sprocket on the left in addition to a disc brake? Do you have an above, or behind picture?

This is an awesome project. You won't have any pedal clearance issues because the pedals are like three feet away from the wheel - you couldn't have picked a better bike to start mounting motors and batteries to.

So, a couple of things:

+ I'm totally copying your motor sprocket design. I used the stock motor sprocket to drive a fine-toothed gear from an electric scooter - I don't have a pin driver for whatever tiny chain those things use, and it was a complete PITA to work with.

+ Eric Peltzer - the guy in the link you sent - is amazing. At this point his bike is basically a fifty-pound electric dirtbike - he had to go through a number of revisions until he got it right, though. I recall that he complained how his first two-chain, four sprocket gear-reducer was so loud that he might as well have used an internal combustion engine.

+ This post is too long.

+ Here is a page from a motorized bicycle kit site that has some pictures of the giant sprockets that these kits use. I got a spare one of these off of ebay, and the seller actually pre-drilled it to bolt up to six-hole bicycle disc brake mounts.

Even the giant 60+ tooth sprockets they use won't gear you quite low enough, but it gets you that much closer.