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I think the idea is that by locking in the rollers position relative to the tooth they reduce the movement/friction between the roller and the tooth, and only reintroduce a fraction of it by more rotation between the chainlinks & rollers. Then they reduce the number of teeth by half, and you get an overall more efficient system.
I think. They're not doing a great job of explaining the how.
And Im sure theyre doing it for commercial purposes to recoup their investment on equipment, but I think its cool that if you had the cash, you could rock up to their own testing rig with your own stuff, and compare apples to apples.
kiskubai
You can't pull a chain from the back of a tooth