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Actually, I'm not sure that's true any more. When I was reading up on them prior to getting my left crank Pioneer, I seem to recall reading that the most recent firmware update negated the need for the magnet. I fitted mine before upgrading so have left it on there, but yeah, shouldn't be needed anymore.
TurtleRecall
@hippy - magnet needed on either chainstay to trigger the PM for each crank rev.