The M.O.P uses two wheel sizes. The Larger drive wheel, and the
smaller caster wheel. There is a close relationship between the
two wheel sizes and chassis ride height.
A M.O.P chassis has fastening points for wheel braces and caster
assemblies. Each of which can be varied depending on required ride
If you don’t need a high
ground clearance the braces and casters are configured to lower
the chassis closer to the ground
(reducing ride height). Small caster wheels can be selected and
the main drive wheels can also be reduced in size. (Of course the
trade off here is that you loose operational speed, but you gain
torque). If you need increased ground clearance, larger wheels
and taller caster assemblies are needed.
Both Caster and main wheel assemblies
must be matched relative to their chassis mounting points. If not
you get one very rocky
rover, see sawing all over the place.