1925 BMW R39
| Engine Engine type Bore x Stroke Displacement Valves Compression ratio Max Power Max Torque Fuel system Transmission Final drive Clutch Ignition type Starting system Lubrication Exhaust Spark plug Battery Gear ratios | Air-cooled, 4-stroke, single cylinder vertical 68.0 x 68.0 mm (2.67 x 2.67 inches) 247 cc OHV 6.0:1 6.5 hp @ 4000 rpm 1 carburettor Type BMW Spezial 20 mm 3-speed Cardan Single plate dry clutch Bosch magneto generator type G 1.8V/15W Kick starter Lubrication by gear pump in sump Bosch W 175 6 volt 12 amp hour |
| Dimensions Frame type Castor Overall length Overall width Overall height Wheelbase Seat height Ground clearance Dry weight Fuel capacity Colors Suspension (front) Suspension (rear) Tyre (front) Tyre (rear) Brake (front) Brake (rear) | Twin loop tubular frame 2050 mm (80.70 inches) 800 mm (31.49 inches) 950 mm (37.40 inches) 1380 mm (54.33 inches) 785 mm 185 mm (7.3 inches) 110 kg 10 litres Plate spring, 4 laminae Rigid 27 x 3.5 balloon or with 26 x 3 high pressure tyres 27 x 3.5 balloon or with 26 x 3 high pressure tyres Internal shoe drum brake 150 mm / 5.90 in diameter External shoe brake at the gearing on Cardan shaft |
Image: http://www.bmbikes.co.uk
