BMW R 25
Number sold 23.400
Price 1.750,- DM
| Engine | |
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| internal designation | 224/2 |
| engine type | four-stroke two-cylinder flat-twin |
| Bore/stroke | 68 x 68 mm |
| Cubic capacity | 247 cm3 |
| Max power | 12 PS at 5600 U /min |
| Compression ratio | 6,5 : 1 |
| Valves per cylinder | ohv |
| Carburation system | 1 Bing type 1 / 22 / 28 |
| 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 | 4,5 : 1 (with sidecar 5,14 : 1) |
| Bevel/crown wheel | 6 / 27 teeth (with sidecar 7 : 36) |
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| Electrical system | |
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| Alternator | Noris 6 V / 45-60 W |
| Ignition | battery ignition |
| Spark plugs | Bosch DM 240 T 1or Bosch W 240 T 1 A |
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| Suspension | |
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| designation | 225/1 |
| Type of frame | closed steel twin-loop frame, welded |
| Front suspension | telescopic fork |
| Rear suspension | Geradwegfederung |
| wheel rims | 3 x 19 |
| Tyres front | 3,25 x 19 |
| Tyres rear | 3,25 x 19 |
| Brakes front | drum brake Ø 160 mm |
| Brakes rear | drum brake Ø 160 mm |
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| Dimensions and weights | |
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| Length x width x height | 2073 x 750 x 710 mm |
| Ground clearance | 108 mm |
| Tank capacity | 12 l |
| Unladen weight, full tank | 140 kg |
| permitted loading | 290 kg (with sidecar 365 kg) |
| Fuel consumption | ca. 3,5 l / 100 km |
| oil consumption | ca. 1 l / 1000 km |
| Top speed | 95 km/h (with sidecar 80 km/h) |
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