BMW R 25/3

BMW R 25/3 Date 1953 - 1956

Number sold 47.700

Price 2.060,- DM

Engine

internal designation 224/4
engine type four-stroke vertical single cylinder engine
Bore/stroke 68 x 68 mm
Cubic capacity 247 cm3
Max power 13 PS at 5800 rpm
Compression ratio 7: 1
Valves per cylinder ohv
Carburation system 1 Bing type 1 / 24 / 41 or SAWE Typ K 24 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 4,16 : 1 (with sidecar 4,8 : 1)
Bevel/crown wheel 6 / 25 teeth (with sidecar 5 / 24)

Electrical system

Alternator Noris ZLZ 60/6/1600 L
Ignition battery ignition
Spark plugs Bosch W 240 T 1

Suspension

designation 225/3
Type of frame closed steel twin-loop frame, welded
Front suspension telescopic fork
Rear suspension telescopic fork
wheel rims 3 x 18
Tyres front 3,25 x 18
Tyres rear 3,25 x 18
Brakes front drum brake 160 mm, full hub
Brakes rear drum brake 160 mm, full hub

Dimensions and weights

Length x width x height 2065 x 760 x 730 (saddle) mm
Wheel base 1365 mm
Ground clearance 105 mm
Tank capacity 12 l
Unladen weight, full tank 150 kg
permitted loading 320 kg (with sidecar 450 kg)
riding/exhaust noise 82 / 84 phon
Fuel consumption ca. 2,9 l / 100 km
oil consumption ca. 0,7 l / 1000 km
Top speed 119 km/h (with sidecar 88 km/h)

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