My main concern is gearing I have a 40 tooth for the back wheel but I don't know if it will be tall enough? Any suggestions would be appreciated! I am using a hub adapter that fits like a glove and I'm sure I can get different sizes for it but what I need i have no idea. I'm running a stock 60 cc grubby and plan on keeping it stock, mainly to take to car shows and ride it very little because this thing will be scary dangerous to ride