[Chris Endres]

Originally Posted by FrankJ

As long as if you picked up your robot and put it on flat ground and your bumper are in the bumper zone, you are legal. So pushing on flat ground your bumpers have to be at / below 12". Pushing on say the rock wall might legally raise your bumpers higher.

Exactly, the bumpers are measured while at their maximum intended height (intended meaning the robot intentionally positions itself i.e. actuated piston) on a flat surface. Being on the ramp while having the piston extended is completely legal.