The Sd.Kfz.2 (Sonderkraftfahrzeug 2) is a half-track motorcycle with a single front wheel, better known as the Kleines Kettenkraftrad HK 101 or Kettenkrad for short (plural Kettenkräder; where Ketten means "chains" or "tracks" and krad is the military abbreviation of the German word Kraftrad, the administrative German term for motorcycle)