BMW R2 — Wikipedia, the free encyclopedia

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Background [ edit ]

In BMW introduced the 247cc R39, [ 1 ] [ 2 ] first single-cylinder motorcycle. The R39 did not well and was discontinued in 1927. [ 2 ]

the collapse of the Weimar Republic during the Wall Street of 1929. BMW’s premier capacity, expensive motorcycle was hard hit, with customers able to afford premium purchase costs. BMW felt the need to introduce a bike into their which offered both purchase costs and less running costs.

The firm also wished to their range by making a available to riders without a licence, which was not required for under 200cc. [ 3 ] This led to the introduction in 1931 in the form of the 1, of which 4,161 units sold during its one-year run until the introduction of the improved 2A the following year. [ 4 ] It was known as the bike, [ 5 ] [ 6 ] and was priced at 975RM, [ 4 ] to 1,750RM for the 750cc flat-twin R11 2 of the same year.

Models [ edit ]

In all models, the overhead valve four-… was mounted in a pressed-steel frame. [ 5 ] It both sump oil and forced-feed provided by a geared oil pump, was through a single-plate dry clutch to a gearbox, [ 4 ] giving a top speed of (59mph). [ 4 ] It also used brakes, like the larger of the BMW range. Power output was at 6hp (4.5kW), until the introduction of the Amal carburetor. boosting the output to 8hp (6.0kW). The coil ignition system and the generator supplied by Bosch. [ 4

] The engine was offset toward the of the frame, to allow it to drive the wheel directly when in top [ 6 ]

Variants [ edit ]

Series 1 the only model to feature valve springs on the top of the finned head

Series 2A (1932): the exposed valve springs covered

Series 2/33 the option of the British Amal (as to the German Sum) carburetor was (around 80 units were with this specification) and June 1933) a friction was introduced for improved steering whilst riding

Series 3 (1934): the Sum carburetor was as an option, replaced by the British which increased the power from 6 to 8hp

Series 4 (1935): tank and modified headlight

5 (1936): changed ratio of the drive and wider rear with license plate


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