The SdKfz 2, better known as the Kleines Kettenkraftrad HK 101 or short Kettenkrad (Ketten = tracks, krad = military short form for motorcycle as an abbreviation for the German word "Kraftrad", the administrative German term for motorcycle), started its life as a light tractor for airborne troops. The vehicle was designed to be delivered by Junkers Ju 52 aircraft, though not by parachute. The vehicle had the advantage of being the only gun tractor small enough to fit inside the hold of the Ju 52.
The Sd Kfz 2 was designed and built by the NSU Motorenwerke AG at Neckarsulm, Germany. Later in the war Stoewer from Stettin also produced Kettenkrads under license, accounting for about 10% of the total production.