BMW R 11 series 1

BMW R 11 series 1 Date 1929-1930

Number sold 7.500 (series 1 - 5)

Price 1.750,- RM

Engine

Internal Designation M 56
Engine type four-stroke two-cylinder flat-twin
Bore/stroke 78 x 78 mm
Cubic capacity 745 cm3
Max power 18 PS at 4000 rpm
Compression ratio 5,5 : 1
Valves per cylinder sv
Carburation system 1 carburettor, Typ BMW 24 mm
Engine lubrication forced-feed lubrication
Oil pump gear pump

Power transmission

Clutch single discs, dry
Number of gears 3
Shifting manual
Gear ratios 2,83 / 1,55 / 1,08
Rear wheel ratio 1 : 4,07 (sidecar 1 : 5,18 or 1 : 4,75)
Bevel/crown wheel 14 / 57 teeth (sidecar 11 / 57 or 12 / 57)

Electrical system

Alternator Bosch magneto generator D 2 L or magneto ignition FF2
Ignition magneto ignition
Spark plugs Bosch W 175 T 1

Suspension

Designation F 66
Type of frame twin-loop pressed steel frame
Front suspension plate spring, 9 laminae
Rear suspension rigid
wheel rims 26 x 3,5 safety rims rims
Tyres front 26 x 3,5 low pressure or 26 x 3,25 high pressure
Tyres rear 26 x 3,5 low pressure or 26 x 3,25 high pressure
Brakes front drum brake 200 mm
Brakes rear cardan brake, breite 37 mm

Dimensions and weights

Length x width x height 2100 x 800 x 940 mm
Wheel base 1380 mm
Tank capacity 14 l
Unladen weight, full tank 162 kg
Load rating 210 kg
Fuel consumption ca. 4 - 4,5 l / 100 km
Oil consumption ca. 1 - 2 l / 1000 km
Top speed 95 - 100 km/h

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