The air pump already has a space on the HP2, but there are two catches: On the one hand, the air pump can easily be stolen as it can be removed from below. On the other hand, it will almost jump up and hit you when opening the seat. The new space under the seat is theft-proof and protects it from heavy soiling. A strap fixed to the frame keeps the pump in place. The strap serves as an additional clamp so that the pump does not come off.