[nitneylion452]

Originally Posted by EricH

On the moment of contact, the front wheels hit with the axle at the top level of the bump. They won't roll up and over without help--their force at that point will be entirely vertical once they leave the ground, but without something to push them horizontally, they'll fall back down. The back wheels are what provide the horizontal force to get the wheel up on top of the bump.

Might it not be fair to assume (or at least hope) that the rollers on mecanum wheels or other deep crevices would catch the lip of the bump and then provide a stronger vertical component and thus be able to pick the robot up?

By virtue of mecanums having rollers, it would also be safe to assume that the roller will roll (gasp!) off the lip. Countered my own argument for mecanums, but not other wheels. Any opinions on that?