|
Engine
|
| Internal designation | 268 / 1 |
| Type | four-stroke, two-cylinder, air-cooled boxer |
| Bore/stroke | 72 x 73 mm (2.83 X 2.87 inches) |
| Cubic capacity |
594 cm3 (34 inches3) |
| Maximum power | 35 HP at 7000 RPMs |
| Compression ratio | 8.0 : 1 |
| Valves per cylinder | ohv |
| Carburation system | 2 Bing 1/26/9 - 1/26/10 |
| Engine lubrication | forced-feed lubrication |
| Oil pump | gear pump |
| Power Transmission |
| Clutch | single disc saucer spring, dry |
| Number of gears | 4 |
| Shifting | foot shifting (auxiliary manual lever on gear block) |
| Gear ratios | 4.00 / 2.28 / 1.7 / 1.3 (with sidecar: 5.33 / 3.02 / 2.04 / 1.54) |
| Rear wheel ratio | 1 : 3.89 (with sidecar 1 : 4.75) |
| Bevel/crown wheel | 9 / 32 teeth solo (8 / 35 teeth with sidecar) |
| Electrical System
|
| Generator | Noris 6V 45/60 L |
| Ignition | magneto ignition |
| Spark plugs | Bosch W 240 T 1 or Beru 240 / 14 |
| Suspension
|
| Designation | 251/4 |
| Type of frame | Double-loop steel tubular frame |
| Front suspension | Telescopic fork |
| Rear suspension | Telescopic (plunger) suspension |
| Wheel rims | 3.50 x 19 |
| Tires front | 3.50 x 19 |
| Tires rear | 3.50 x 18 ( at sidecarbetrieb hinten 4 x 18) |
| Brakes front | Drum brake Ø 200mm / 7.87 inches diameter duplex; for 1954: full hub |
| Brakes rear | Drum brake, Ø 200 mm / 7.87 in diameter simplex; from 1954 full hub |
| Dimensions and Weights
|
| Length x width x height |
83.85 x 28.5 x 38.77 inches (2130 x 725 x 985 mm) |
| Wheel base
| 55.1 inches (1400 mm) |
| Tank capacity |
4.49 gallons (17 liters) |
| Unladen weight, full tank | 422 pounds (190 kilograms; with orig. BMW sidecar 320 kilograms) |
| Load rating | 781 pounds (355 kilograms) solo |
| Performance
|
| Idle/riding noise | 85/96 DIN-phon (from 7/7/1953: 80 / 87 dB (A)) |
| Fuel consumption |
51.0 MPG (ca. 4.6 liters / 100 km) |
| Oil consumption | ca. 0.7 liters / 1000 km |
| Top speed |
105 MPH (168 km/h) |
BMW R68
