Hi, I'm in the process of getting a 1968 rokon, it has been totally rebuilt and looks and sounds great. The only question I have is that the main drive chain is rubbing against the rear tire. The owner said this is normal with all rokons. Is this something I should be concerned about? Please let know if this is a small fix or not. If it's possible please email me tonite or as soon as possible at bvg310@yahoo.com. Thanks bvant