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I also really like the idea of 4-bar, high pivot, idler. I think it's a recipe that gives the bike designer the ability to optimize the suspension kinematics, rear brake performance, and pedaling characteristics, without having to make any major compromises. Kudos to Forbidden for blazing the path and demonstrating an idler pulley bike can pedal well and be efficient.
Regarding the affect that the idler pulley removes the change in pedaling characteristics due to change in chain ring size, that's a great point and one I've never considered!
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