| MODEL | BMW R 80G/S 1980 |
| Year | 1980 |
| Engine Type | Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder |
| Displacement / Capacity | 797.5 cc / 48.7 cu in |
| Bore X Stroke | 84.8 x 70.6 mm |
| Compression Ratio | 8.2:1 |
| Cooling System | Air cooled |
| Max Power | 37 kW / 50 hp @ 6500 rpm |
| Max Torque | 56.7 Nm / 41.9 lb-ft @ 5000 rpm |
| Ignition | Battery ignition |
| Induction | 2 x Bing constant depression carburetors |
| Start System | Electric & kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 5 Speed |
| Clutch | Dry single plate, with diaphragm spring |
| Final Drive | Shaft |
| CHASSIS SPECS | |
| Frame | Double loop tubular frame with bolt-on rear section |
| Front Suspension | Telescopic hydraulic forks, 200 mm / 7.9 in travel |
| Rear Suspension | Monolever single-sided swingarm, single shock, 170 mm / 6.7 in travel |
| Front Brakes | Single 260 mm disc |
| Rear Brakes | 200 mm drum |
| DIMENSION SPECS | |
| Overall Length | 2230 mm / 87.8 in |
| Overall Width | 820 mm / 32.3 in |
| Overall Height | 1150 mm / 45.3 in |
| Seat Height | 860 mm / 33.9 in |
| Wheelbase | 1465 mm / 57.7 in |
| Ground Clearance | 175 mm / 6.9 in |
| Dry Weight | 167 kg / 368 lbs |
| Wet Weight | 186 kg / 410 lbs |
| WHEEL SPECS | |
| Front Tyre | 3.00 - 21 |
| Rear Tyre | 4.00 - 18 |
| FUEL SYSTEM | |
| Fuel Capacity | 19.5 Litres / 5.2 US gal |
| Fuel Consumption | 5.2 L/100 km / 45 US mpg |
| Top Speed | 168 km/h / 104 mph |
Photo: Gastair, CC BY-SA 4.0, via Wikimedia Commons
Photo: Michael Fielitz, CC BY-SA 2.0, via Wikimedia Commons
The R 80 G/S launched BMW's large-capacity dual-purpose class in 1980, pairing the 800 cc boxer from the R 80/7 with an R65-derived frame, long-travel suspension and a 21-inch front wheel. Its headline novelty was the Monolever single-sided swingarm, which carried the drive shaft and made rear wheel removal quick. Testers found it light and quick on the road but only modestly capable on rough dirt.
