silly stuff...
I don't really think that effort "explanation" really is right either...
I guess that's why I use small glasses when I drink beer.. reduces my "lift effort"..
anyways, a "single pully does not reduce effort.. just changes the direction of the pull... E=W
in order to "reduce" effort" a second pully must be added into the equation, and there in lies the "reduction", but again, some effort is lost due to friction on the pullies..
https://www.engineeringtoolbox.com/pulleys-d_1297.htmlwhat is being seen in that BMW farkle, is not really due to the directional change, as much as because of the "lever" principle, based on the actual "diameter" of said chain gear ; which does give specific advantage of the "lever" due to it's "distance from the rotational axis"