They mount with a big one ring. Set the base on something round, hood one end of the o ring to the base, wrap the o ring around a round pipe then hook the o ring to the other side of the base. It will go anywhere. Handle bar, frame tube, even a foot peg if you felt like it. Currently mine is on the cross bar between the handle bars. I think I'm going to get a second one and have one on each side of the frame down low.