An attachment for two-wheeled vehicles and a wheel for a two-wheeled vehicle having these attachments are provided. The wheel includes a hub, a rim and separate spokes connecting the hub and the rim. Portions of the spoke nipples protruding radially inwardly from the rim are covered by cover caps. The cover cap is configured small in structure and aerodynamic in shape. To this end, the length in the peripheral direction is larger than the width.