It is proposed to provide the aircraft undercarriage having wheel units which have at least one wheel (6), with a device (10) for applying a rotational movement to a wheel (6) which is located at a distance from the runway (20). The wheel (6) can be accelerated before touching the runway (20) such that the circumferential speed of the tread essentially corresponds to the horizontal component of the landing speed of the aircraft, as a result of which excessive tyre wear is prevented. <IMAGE>
