One of the challenges of making large stuff is making it move.  The past 2 robots had been driven by tank tracks but I thought I would try something else.  So I posted on Eurobricks asking about giant wheel designs as Lego don’t make large wheels.  I had some awesome feedback and here is the result.

Update:
I must actually update the video as it works a lot better now.  I have replace the 16 long technic studded beams on the outer rim to be 15 long studless beams so that it does not lock up (clicking noise on video).

I have also removed the front set of balancing wheels and counter balanced the back ones so that it looks more impressive.  I will post an update soon.