The Double Racer (German: Rennzweier) is a race car manufactured by the Nesselsdorfer Wagenbau-Fabriksgesellschaft (NW), now Tatra, in 1900.

Hans Ledwinka, the man behind the famous rear-engined Tatras, and at the time only 20 years old, helped in the production of the car.

[2] In 1994, a 2 Kč commemorative stamp featuring the Rennzweier, designed by Bedřich Housa [cs], was issued.

On 23 October 1899, two of these Präsident-derived cars, the Wien and the Nesselsdorf, competed in the first automobile race held in Austria-Hungary.

Baron Theodor von Liebieg [cs], driving the Wien, won the race, and the Nesselsdorf came in second.

[clarification needed] Four days later he won the four-seaters under 1,000 kg (2,200 lb) class in the famous Nice – La Turbie hill climb race.

So after his successes of late 1899 and early 1900, Liebieg commissioned NW to produce a new automobile specifically designed for racing.