Our Rumble Grids are robust and made out of steel. Each unit is 4000mm wide and 2300mm long for ease of transport. You need two sections for one complete tyre revolution. The design of the grid was achieved with the help of a tyre expert to get the maximum tyre deflection and ensure no damage to the tyre walls. Horizontal angles are designed to agitate the tyre to remove any mud, dirt, soil and, loose stones and rocks.