Ok, you didn't mention that assumption when you claimed my post was wrong and I missed your mention of it at the top of this page. I was thinking in theoretical terms of stopping the wheel faster, not necessarily stopping the whole bike/rider unit faster. A larger rotor does provide more powerful braking, wether or not that power is needed or can be utilized is another question. Sorry. I'm still right based on my thinking, and you on yours assuming that both or all systems provide the power to lock up the wheel.