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The smallest rover to fly into space is the MUSES-CN nanorover.

The MUSES-CN is being paid for by the Japanese Institute of Space
and Astronautical Science-C, but is being built by NASA. Struts are
what the nanorover is attached to. On Nereus there is so little
gravity that MUSES-CN can barely stick. The nanorover weighs a
little more then two pounds on Earth. On Nereus 1/10 of a gram is
how much it will way. If the nanorover hits even a little bump it could
flip over and is designed to operate even if that happens. The struts
can pull the nanorover back up if it flips over. There is also away to
point the camera up or down. The struts can move close together so
the body can rotate so the camera points up or down. On the
nanorover wheels it will hop. The nanorover can go one millimeter per
second because of the small gravity of Nereus. It would take 18-1/2
days to go one mile. The MUSES-CN is going to send back pictures of
the asteroid of Nereus.