[kibbs425]

If your really looking at doing this you may want to see about putting all of your gears in an enclosed gearbox with an output shaft that chain drives the wheel pulleys. This will help keep the gears clean and running better, i.e. not wearing down teeth because of grit contaminant. Also look at getting sealed bearings, with REALLY good seals. Girt contaminants can easily destroy any rotating part.