A door tilting system for a slidable vehicle door, and a method for adjusting a door tilting system, where the door tilting system forms part of a pivoting joint between the vehicle door and a movable arm structure connecting the vehicle door to a vehicle body structure. The door tilting system includes an inner socket and an outer socket, where the inner socket is arranged inside the outer socket and rotatably arranged relative to the outer socket. The inner socket includes a receiving opening configured for receiving a fastening device. The receiving opening has an elongated configuration, and the receiving opening is extending in a first direction along a first axis through the inner socket. The door tilting system is configured for changing the first direction of the receiving opening relative to the outer socket upon rotational displacement of the inner socket relative to the outer socket.