I should have expanded on the magnets bit. They would be there for added downforce in the battlebots arena, yes. Im guessing this would be to hold the robot down when they fire the axe or for extra traction when pushing someone.

Incidently, one for your innovations thread, SOW ICE has magnetic tracks but for a slightly different reason. The robot produces so much torque on spin up of the cage that the body would spin round in the opposite direction, equal and opposite forces and all that.

Mark