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Re: gliding wheels....
What you're describing on a bicycle is a one-way or Sprag clutch as Tytus already answered. These are a bad idea for your robot because they would only allow it to be powered in one direction; that is, you'd never be able to go in reverse.
I think you'll find it's much easier to build or buy a small cart than it is to engineer "neutral" into your drivetrain so that you may push it around.
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--Madison--
...down at the Ozdust!
Like a grand and miraculous spaceship, our planet has sailed through the universe of time. And for a brief moment, we have been among its many passengers.
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