BMW R 39 
| Make Model | BMW R 39 | | Year | 1925-27 | | Engine | Air cooled, four stroke, single cylinder vertical, OHV | | Capacity | 247 | | Bore x Stroke | | | Compression Ratio | 6.0:1 | | Induction | 1x BMW Spezial 20 mm | | Ignition / Starting | Bosch magneto generator type G 1.8V/15W / Kick | | Clutch | Single plate, dry | | Max Power | 6.5 hp @ 4000 rpm | | Transmission / Drive | 3 Speed | | Gear Ratio | 1st 6 2nd 9.28 3rd 13.7 | | Frame | Twin loop tubular frame | | Front Suspension | Plate spring, 4 laminae | | Rear Suspension | Rigid | | Front Brakes | Internal shoe drum brake 150 mm / 5.90 in diameter | | Rear Brakes | External shoe brake at the gearing on Cardan shaft | | Front Tyre | 27 x 3.5 balloon or with 26 x 3 high pressure tyres | | Rear Tyre | 27 x 3.5 balloon or with 26 x 3 high pressure tyres | | Wet-Weight | 110 kg / 242 lb | | Fuel Capacity | 10 Litres / 2.6 gal | |
