| MODEL | BMW R 100CS 1980 |
| Year | 1980 |
| Engine Type | Four stroke, two cylinder horizontally opposed Boxer, 2 valves per cylinder |
| Displacement / Capacity | 980 cc / 59.8 cu in |
| Bore X Stroke | 94 x 70.6 mm |
| Compression Ratio | 9.5:1 |
| Cooling System | Air cooled |
| Max Power | 51 kW / 70 hp @ 7000 rpm |
| Max Torque | 76 Nm / 7.75 kgf-m / 56 lb-ft @ 6000 rpm |
| Ignition | — |
| Induction | 2 x Bing 94/40 constant-depression carburettors |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 5 Speed |
| Clutch | Dry single plate, diaphragm spring |
| Final Drive | Shaft |
| CHASSIS SPECS | |
| Frame | Double cradle tubular steel frame, bolt-on rear section |
| Front Suspension | Telescopic fork with hydraulic damping, 200 mm / 7.8 in travel |
| Rear Suspension | Long swingarm with adjustable shock absorbers, 125 mm / 4.9 in travel |
| Front Brakes | Double 260 mm discs |
| Rear Brakes | 200 mm drum |
| DIMENSION SPECS | |
| Overall Length | 2110 mm / 83.1 in |
| Overall Width | 746 mm / 29.4 in |
| Overall Height | 1210 mm / 47.6 in |
| Seat Height | 820 mm / 32.3 in |
| Wheelbase | 1465 mm / 57.7 in |
| Ground Clearance | 165 mm / 6.5 in |
| Dry Weight | — |
| Wet Weight | 220 kg / 484 lbs |
| WHEEL SPECS | |
| Front Tyre | 3.25 H19 |
| Rear Tyre | 4.00 H18 |
| FUEL SYSTEM | |
| Fuel Capacity | 24 Litres / 6.3 US gal |
| Fuel Consumption | 4.8 L/100 km / 20.8 km/l / 49 US mpg |
| Top Speed | 200 km/h / 124 mph |
The R 100 CS succeeded the R 100 S as the sporting unfaired boxer, using the 70 hp high-compression engine with a small handlebar cockpit fairing and slightly less weight than the S. It could not match Japanese 1000s for acceleration, relying instead on durability, finish and easy owner maintenance.
