BMW R 25/2

BMW R 25/2 Date 1951 - 1953

Number sold 38.651

Price 1.990,- DM

Engine

Internal Designation 224/3
Engine type four-stroke vertical single cylinder engine
Bore/stroke 68 x 68 mm
Cubic capacity 247 cm3
Max power 12 PS at 5800 rpm
Compression ratio 6,5 : 1
Valves per cylinder ohv
Carburation system 1 Bing type 1 / 22 / 44 or SAWE Typ K 22 F
Engine lubrication forced-feed lubrication
Oil pump gear pump

Power transmission

Clutch single discs, dry
Number of gears 4
Shifting foot Shifting (+ auxiliary manual switch on gearing block)
Gear ratios 6,1 / 3,0 / 2,04 / 1,54
Rear wheel ratio 4,5 : 1 (with sidecar 5,14 : 1)
Bevel/crown wheel 6 / 27 teeth (with sidecar 7 : 36)

Electrical system

Alternator Noris ZLZ 45/60; 6 V / max. 60 W
Ignition battery ignition
Spark plugs Bosch DM 240 T 1

Suspension

Designation 225/2
Type of frame closed steel twin-loop frame, welded
Front suspension telescopic fork
Rear suspension telescopic fork
wheel rims 3 x 19
Tyres front 3,25 x 19
Tyres rear 3,25 x 19
Brakes front drum brake 160 mm
Brakes rear drum brake 160 mm

Dimensions and weights

Length x width x height 2020 x 790 x 730 (saddle) mm
Wheel base 1335 mm
Ground clearance 92 mm
Tank capacity 12 l
Unladen weight, full tank 142 kg
permitted loading 300 kg (with sidecar 375 kg)
riding/exhaust noise 84 / 85 phon
Fuel consumption ca. 2,9 l / 100 km
Oil consumption ca. 0,7 l / 1000 km
Top speed 105 km/h (with sidecar 80 km/h)

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