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I was wondering how they could traverse rough terrain like gravel. That video explains how the overlapping wheels makes that possible. Why not go with a "tank tread" type design? Maybe in a future hiking version.

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I'm assuming different wheels are accelerating at slightly different speeds so you aren't hitting the pavement with a tread going at full speed. It needs to adjust to the different speed of your gait at different points of your step.

That's why the "tank tread" likely wouldn't work here.

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