I would consider that, "very strong riders," would be able to put out twice the peak and average power that I, a mere mortal, could. That said, if they had a stock Calfee tandem, I'm about certain they could flex it. Now, if they wanted one stiff enough, Craig, knowing of their strength, would build one stiff enough for them. Saying that a Calfee tandem is flexy based on what happens with two, "very strong riders," does not indicate in any way that Calfee tandems are any more flexible than any other brand of tandem.
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