re: Motorized Bicycle Take a Tip...Leave a Tip
i would recommend the middle front sprocket, which is usually 38 teeth. you will have to grind the center about 1/4'' larger to fit it over the hub, and most likely drill holes for the bolts. i've done this myself, it was a lot of work. i was trying to make a derailleur assembley so i could change gears without a jackshaft, but it was way too hard to make the chain move right. if anyone tries it you need to convert to regular bike chain first. (if your trying to make a derailleur on the left side of the wheel, the chain works fine for single speed)
its only too fast if you cant stay on!