There is nothing to argue since there is more slop in a chain then in a belt at point of movement. Aluminum chain sprockets are more common then you think as are aluminum belt pulleys. Aluminum pulleys wear before belts do. I have an aluminum sprocket on my 71 Bonnie dirt dragger. It only changes gears twice. I remember when people said that aluminum hubs wouldn't last vs steel....and that mindset still continues. Facts is facts.
