Think of being on ice. The smaller the tire foot print, the higher the psi, and thus.... better the traction. Let's say the wheel provided has a footprint of 1 square inch, your robot comes in at 120 lbs and you have 8 wheels with the weight evenly distributed. Then you have 15 psi. Go to 6 wheels and your at 20 psi. Go to 4 wheels and you are at 30 psi, 2 wheels.... I think you get the idea.
Ideally, one wheel would be best. Let me know how to make that work.
I'm still in search of a very large bucket!
