[EricH]

Originally Posted by DRH2o

Other than the bumper rule -- has anyone seen anything that says the robot has to have "x" amount of groung clearance. ie.-- bumper must be between 2.5 and 8.5 inches ( bottom and top )

Nothing says how much or little ground clearance is required; however, there are variations of 1/2" (+or- 1/4") around the base of the lane divider. You could have a robot whose frame drags on the ground or one that is a foot off the ground other than wheels. It's your call. Just as long as the bumpers are where they need to be and you don't violate any of the robot rules (Section 8), you're fine.