Abstract: The invention relates to an adaptive attachment wheel for wheelchairs, formed as a unit consisting of: a wheel (5); frame segments (1); adaptation shells (7, 8) for lateral guidance on the wheelchair front tubes; and at least one holding element (6) that can be fastened to the wheelchair; such that, when the adaptive attachment wheel is attached to the wheel-chair, the adaptation shells (7, 8) are brought together with the wheelchair front tubes, the front casters of which are lifted off of the ground, and a three-wheeled wheelchair is produced, the front wheel (5) of which can be steered and braked by means of an one-hand steering system (13).