Interesting article

I disagree with the effectiveness idea you brought forward. A chain, while under acceleration is tight, when it does become loose, the timing of the cam will change. The gear drive stops this. Technically, a gear drive is a win win period. A chain is always a loser, no way around that unless someone invents a completely unstretchable never wearing gear set. It is just a matter of time of when and how much the chain will stretch. Not IF.