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NSU Rennmax 250 1954

The Rennmax 250, like the Rennfox 125, made its debut in 1952. Although it did not win any world championship race that year, it nonetheless had all the qualities that were needed to stand up against the Moto Guzzis ridden by Lorenzetti and Fergus Anderson.
In 1953 Werner Haas won both the 125-class and the 250-class championships with NSUs. This was a surprise upset, because at the beginning of the season the Italian vehicles were the favorites.

The Rennmax that Haas rode in 1953 was a four-stroke, two-cylinder two-wheeler developed from the prewar supercharged 500. It had two-shaft overhead distribution with bevel gears. The engine generated 30 h.p. at 10,500 r.p.m.
Although the Rennmax proved to be slightly better in performance than competing motorcycles in its class, it was completely overhauled in 1954. The distribution was redesigned to operate by a single shaft acting on the axis of the intake cam. The transmission was given a sixth speed, and the bore and stroke were readjusted.

Haas rode the 1954 Rennmax 250 to victory in all the races he entered. He won his second world championship with the Rennmax. Even when NSU announced its retirement from racing the following year, it seemed clear that the Rennmax would continue to lead the field for some

Motorcycle: NSU Rennmax 250 Manufacturer: NSU, Neckarsulm Type: Racing Year: 1954
Engine: NSU two-cylinder, four-stroke, with double overhead distribution, two shafts with bevel gears. Displacement 249.3 cc. (55.9 mm. x 50.8 mm.)
Cooling: Air
Transmission: Six-speed block Power: 39 h.p. at 11,500 r.p.m. Maximum speed: 135 m.p.h. (with bell fairing)
Chassis: Single-bar stamped plate, engine suspended and projecting. Front wheel, swinging-link suspension; rear wheel, telescopic
Brakes: Front and rear, central drum with double cam