Segment: Clasic
Production years: 1938, 1939, 1940
In 1937, BMW released the R20, a replacement for the R2 and the first motorcycle that used a bolted tubular steel frame. Like the R2, the new R20 model was designed for a series with an up to 200cc class which didn’t require a motorcycle license at the time.
Unfortunately, the BMW R20 did not have a long life in the BMW range due to 1938 licensing regulations changes which required a license for motorcycles with displacements up to 250cc.
On the front suspension, the leaf spring was replaced by a telescopic fork, while the rear remained rigid. The toolbox was placed in a container on the top of the tank, unlike the R2 which was housed in a separate box behind the battery.
The newly developed 192cc air-cooled four-stroke single-cylinder engine had the same output as the R2, with 8 hp available at 5,400 rpm, but was a little more revving due to the 60 mm bore and 68 mm stroke as a clear long-stroke engine.
Also, the 1937 BMW R20 had the same weight as the R2, with a curb weight of 130 kg (286 lbs) and a top speed of 95 kph (58 mph).
The deceleration power of the bike was due to a 160 mm front drum brake and a 180 mm rear drum brake.
The bike came with standard features such as wire-spoked wheels, a rear luggage rack, a round headlamp, a sprung seat, and full fenders.
engine specs | Type: | air-cooled, four-stroke, single cylinder, OHV, 2 valves | Displacement: | 192 cm3 | Bore X Stroke: | 2.7x2.7 in OR 69 mm | Compression Ratio: | 6.0:1 | Horsepower: | 8/5400 KW(hp)/RPM | Torque: | 0/- lb-ft/RPM OR 0 Nm/RPM | Fuel System: | Amal carburetor |
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transmission specs | Gearbox: | 3-speed, manual | Clutch: | dry, single plate | Primary Drive: | - | Final Drive: | shaft |
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chassis specs | Frame: | steel | Front Suspension: | telescopic fork | Rear Suspension: | hard-tail, sprung seat | Front Brake: | 160mm drum | Rear Brake: | 180mm drum |
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dimension specs | Overall Length: | - | Overall Width: | - | Seat Height: | - | Wheelbase: | - | Ground Clearance: | - | Weight: | 287 lbs OR 130 kg | Fuel Capacity: | 3.2 gallons OR 12.1 L |
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tyres specs | Front: | 3.00 x 19 | Rear: | 3.00 x 19 |
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