The BMW R25 3 motorcycle specifications include a 247 cc (15.07 cu in) engine, power of 13.1 hp (9.5 kW) @ 5,800 rpm, a 4-speed gearbox, and a listed weight of 150 kg (330.7 lb).
Key specifications
The 1953 model is treated as the standard specification. Only later model years with a different supplied value are shown below.
How the BMW R25 3 compares
This compares the motorcycle with all BMW models in this specifications database. The blue marker is this model and the grey line is the BMW database average.
About 84% lower than the BMW database average. Around the 3rd percentile across BMW models.
About 73% lower than the BMW database average. Around the 4th percentile across BMW models.
About 34% lighter than the BMW database average. Around the 5th percentile across BMW models.
About 10% lower than the BMW database average. Around the 4th percentile across BMW models.
About 38% smaller than the BMW database average. Around the 6th percentile across BMW models.
BMW database percentile rankings
Percentiles show where this motorcycle sits across the BMW specifications database. They are descriptive database rankings, not performance ratings.
13.1 hp — more powerful than about 3% of BMW models with power data.
247 cc — larger displacement than about 4% of BMW models.
150 kg — heavier than about 5% of BMW models, or lighter than about 95%.
730 mm — taller than about 4% of BMW models.
12 L — larger than about 6% of BMW fuel tanks in this database.
Dimensions compared with BMW average
Each measurement is compared with the average value across BMW models where that dimension is available.
2,065
2,193
6% below average.
760
877
13% below average.
710
1,199
41% below average.
1,335
1,497
11% below average.
730
809
10% below average.
92
125
26% below average.
Mechanical overview
Additional useful specifications
| Front tire size | 3.27-18 |
|---|---|
| Rear tire size | 3.27-18 |
| Estimated theoretical fuel range | 414 km |
| Power-to-weight ratio | 0.087 hp/kg |
| Power-to-weight | 87.3 hp/tonne |
| Specific power | 53.0 hp/L |
| Bore/stroke ratio | 1.00:1 (Square) |
Engine specifications
| Engine type | Single cylinder, four-stroke |
|---|---|
| Displacement | 247 cc (15.07 cu in) |
| Power | 13.1 hp (9.5 kW) @ 5,800 rpm |
| Bore × stroke | 68.0 x 68 mm (2.7 x 2.7 inches) |
| Compression ratio | 7.1:1 |
| Cooling system | Air |
| Fuel system | Carburettor. Bing |
| Fuel control | Overhead Valves (OHV) |
| Ignition | Battery |
| Starter | Kick |
| Lubrication | Wet sump |
Transmission and drivetrain
| Gearbox | 4-speed |
|---|---|
| Final drive | Shaft drive (cardan) (final drive) |
| Clutch | Single plate dry-cable operated |
Chassis and suspension
| Frame | Closed steel loop-welded |
|---|---|
| Front suspension | Cartridge |
| Rear suspension | Telscopic |
Brakes, wheels and tires
| Front brakes | Expanding brake (drum brake) |
|---|---|
| Rear brakes | Expanding brake (drum brake) |
| Front tire | 3.27-18 |
| Rear tire | 3.27-18 |
Dimensions and weight
| Wet weight | 150 kg (330.7 lb) |
|---|---|
| Seat height | 730 mm (28.7 inches) |
| Overall length | 2,065 mm (81.3 inches) |
| Overall width | 760 mm (29.9 inches) |
| Overall height | 710 mm (28.0 inches) |
| Wheelbase | 1,335 mm (52.6 inches) |
| Ground clearance | 92 mm (3.6 inches) |
| Carrying capacity | 320kg |
Fuel and emissions
| Fuel capacity | 12.00 L (3.17 US gal) |
|---|---|
| Fuel consumption | 2.90 L/100 km (34.5 km/l or 81.11 mpg) |
| Greenhouse gases | 67.3 CO 2 g/km. (CO2 – Carbon dioxide emission) |
Performance
| Top speed | 119.0 km/h (73.9 mph) |
|---|
Electrical and instruments
| Battery | Lubrication system |
|---|
Other specifications
| Seat | Spring-mounted seat |
|---|---|
| Comments | 88Kph is the top speed with original sidecar. |
Disclaimer: Specifications may vary by market, trim, production date and optional equipment, and scraped or historical data can contain errors. Comparison and percentile values are calculated from BMW models in this specifications database. Always double-check important specifications against the motorcycle owner’s/service manual and official BMW information before relying on them. Visit the official BMW website.