BMW R 25/3
BMW R 25/3
      1954 R25/3

Dates: 1953 — 1956

Number sold 47,700

German Price: DM 2,060.-
1954 U.S. retail price: $680


Engine

Internal Designation 224/4
Motor Type four-stroke single-cylinder vertical
Stroke 68 x 68 mm
Displacement 247 ccm
Max Power 13 hp at 5800 rpm
Compression Ratio 7.0:1
Valves ohv
Carburetion System 1 x Bing type 1/24/41 or SAWE type K 24 F
Engine Lubricating System forced-feed lubrication
Oil Pump gear pump

Power Transmission

Clutch single-plate, dry
Number of Gears 4
Shifting foot switching (+ auxiliary manual switch on gearing block)
Gearbox Ratios 6.1/3.0/2.04/1.54
Rear Wheel Ratio 4.16:1 (with sidecar 4.8:1)
Bevel/Crownwheel 6/25 teeth (with sidecar 5:24)

Electrical System

Ignition System battery ignition
Generator Noris ZLZ 60/6/1600 L
Spark Plugs Bosch W 240 T1

Chassis

Designation 225/3
Frame closed steel twin-loop frame, welded
Front Wheel Suspension telescopic fork
Rear Wheel Suspension telescopic suspension
Wheel Rims 3 x 18 deep-bed
Tyres front 3.25 x 18
Tyres rear 3.25 x 18
Brakes front drum brake 160 mm, full width
Brakes rear drum brake 160 mm, full width

Dimensions and Weights

Length x Width x Height 2065 x 760 x 730 mm (Saddle)
Wheel Base 53.7 inches (1365 mm)
Fuel Tank Capacity 3.17 gallons (12 liters)
Unladen Weight, Full Tank 330 pounds (150 kg)
PermittedWeight Limit 705 lbs. (320 kg — with original sidecar 450 kg )
Clearance 3.6 inches (92 mm)

Performance

Idle/Riding Noise 82/84 phon
Fuel Consumption 81 MPG (2.9 liters/100 km)
Oil Consumption 2.4 pints/1000 mi. (0.7 liters/1000 km)
Top Speed 74 MPH (119 kph — with original sidecar 88 kph)