A tandem doesn't have any lateral flex does it (apart from what is inherent in the frame).
No. But it only has two wheels.
Right. So 3rd wheel = extra contact point with the ground. Triangle vs line. Gotcha.
Yeah that's probably easier to visualise - try and connect three points of a circle with a straight line vs two points.
@moocher started
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No. But it only has two wheels.