Corner wheels (one guidance wheel in each corner of the robot) can be used instead of/or together with standard guidance wheels in very narrow aisles. The width between the wheels is easily adjustable with clamping knobs. The corner wheels are adjusted so they are slightly outside of the driving wheels. This is so they take the evenutal impact on the walls in the aisles instead of the driving wheels. This will help the robot to bounce a little in between the walls.

Corner wheels shall only be used if the aisle walls are even. Corner wheels are smaller and stiffer than the standard guidance wheels.

Link: Accessories