| MODEL | BMW R 1100S 2003 - 2004 |
| Year | 2003 - 2004 |
| Engine Type | Four stroke, two cylinder horizontally opposed Boxer, 4 valves per cylinder |
| Displacement / Capacity | 1085 cc / 66.2 cu in |
| Bore X Stroke | 99 x 70.5 mm |
| Compression Ratio | 11.3:1 |
| Cooling System | Air/Oil cooled |
| Max Power | 71.4 kW / 98 hp @ 7500 rpm |
| Max Torque | 97 Nm / 9.9 kgf-m / 71.5 lb-ft @ 5750 rpm |
| Ignition | Bosch electronic, dual ignition (two spark plugs per cylinder) |
| Induction | Bosch Motronic MA 2.4 fuel injection |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | Wet sump |
| Gear Box | 6 Speed |
| Clutch | Dry, single plate |
| Final Drive | Shaft |
| CHASSIS SPECS | |
| Frame | Three-section composite frame (front and rear sections) with load-bearing engine |
| Front Suspension | BMW Telelever, 35 mm stanchions, central strut, adjustable rebound damping, 110 mm / 4.3 in travel |
| Rear Suspension | Paralever, central strut, hydraulic handwheel spring preload adjustment, adjustable rebound damping, 130 mm / 5.1 in travel |
| Front Brakes | 2 x 320 mm discs, 4 piston calipers |
| Rear Brakes | Single 276 mm disc, 2 piston caliper |
| DIMENSION SPECS | |
| Overall Length | 2180 mm / 85.8 in |
| Overall Width | 880 mm / 34.6 in |
| Overall Height | 1160 mm / 45.6 in |
| Seat Height | 800 mm / 31.4 in |
| Wheelbase | 1478 mm / 58.2 in |
| Ground Clearance | — |
| Dry Weight | 208 kg / 459 lbs |
| Wet Weight | 229 kg / 505 lbs |
| WHEEL SPECS | |
| Front Tyre | 120/70-ZR17 |
| Rear Tyre | 170/60-ZR17 |
| FUEL SYSTEM | |
| Fuel Capacity | 18 Litres / 4.76 US gal |
| Fuel Consumption | 6.0 L/100 km / 16.6 km/l / 39.0 US mpg |
| Top Speed | 227 km/h / 141 mph |
From 2003 the R 1100S engine gained twin-spark ignition, with two plugs per cylinder for cleaner combustion and smoother running. Output stayed at 98 hp and the chassis was unchanged. The same year BMW added the BoxerCup Replika, a race-styled version of the S.
