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.
NSU Rennmax specificationsGeneral information
Model: NSU Rennmax
Model Year: 1953
Engine: 248cc 4-stroke DOHC twin
Max speed: 131 mph
Weight: 117 kgs (270 lbs)