BMW R 25/3
Number sold 47.700
Price 2.060,- DM
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| 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 |
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| Power transmission | |
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| 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) |
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| Electrical system | |
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| Alternator | Noris ZLZ 60/6/1600 L |
| Ignition | battery ignition |
| Spark plugs | Bosch W 240 T 1 |
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| Suspension | |
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| 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 Ø 160 mm, full hub |
| Brakes rear | drum brake Ø 160 mm, full hub |
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| Dimensions and weights | |
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| 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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