BMW R1100S
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| Manufacturer | BMW Motorrad |
|---|---|
| Production | 1999–2005 |
| Successor | R1200S |
| Class | Sports, or sport-touring" |
| Engine | 1,085 cc, 4-valve air- and oil-cooled flat-twin boxer |
| Bore / stroke | 99 x 70.5 mm (3.89 x 2.77 in) |
| Compression ratio | 11.3:1 |
| Power | 98 hp (73 kW) |
| Torque | 72 ft/lb |
| Ignition type | Electronic fuel injection, Bosch Motronic MA dual ignition (after 2003) |
| Transmission | 6-speed, shaft drive, dry clutch |
| Frame type | Three section composite frame consisting of front & rear section, load bearing engine |
| Suspension | Front:Telelever Rear: Paralever |
| Brakes | Front: Dual 320 mm (13 in) disc, 4-pot caliper Rear: Single disc 276 mm (10.9 in) Optional ABS |
| Tires | Front: 120 / 70-ZR 17 Rear: 170 / 60-ZR 17 Rear: 180 / 55-ZR 17 (Sport) |
| Wheelbase | 148 cm (58 in) |
| Dimensions |
L: 218 cm (86 in) W: 88 cm (35 in) H: 116 cm (46 in) |
| Seat height | 80 cm (31 in) |
| Weight | 208 kg (459 lb) (dry) 229 kg (505 lb) (wet) |
| Fuel capacity | 18 L (4.0 imp gal; 4.8 US gal) |
| Fuel consumption | 48 miles per imperial gallon (5.9 L/100 km; 40 mpg‑US) |
The BMW R1100S is a sports motorcycle that was manufactured by BMW Motorrad between 1999 and 2005. Introduced some 25 years after the R90S, the company's first sports bike, the R1100S was the first BMW bike having clip-on handlebars, rearset footrests and a removable cowl to cover the pillion seat. Producing nearly 100 hp, it has been described as a "sporty sports-tourer".
The engine is a flat-twin "oilhead" that has air-cooled cylinders but oil-cooled heads. Derived from the BMW R1100RS, the 1,085 cc fuel-injected eight-valve engine is tuned for a maximum output of 98 horsepower (73 kW) at 8,400rpm. At the time of its introduction, it was BMW's most powerful boxer engine ever made, and the first mated to a six-speed transmission. The ohv engine has chain-driven camshafts mounted in the cylinder heads, operating the valves via short pushrods and rocker arms. Engines produced after 2003 had dual ignition, with two spark plugs per cylinder. The compact close-ratio five and subsequently a six-speed transmission is derived from the BMW K1200RS. Far from being a touring overdrive, the top gear gives 20 mph per 1,000rpm, so at 80 mph the engine turns at 4,000rpm.
In addition to using the engine as a stressed member, the R1100S has a composite aluminum frame to which the suspension components are attached. The front suspension is BMW's patented Telelever, with long telescopic fork sliders containing neither springs nor damping. In order to minimize "fork dive", braking forces are taken back to the frame via a pivoting wishbone. A monoshock on this wishbone copes with springing and damping. The rear suspension comprises BMW's "Paralever", a single-sided swinging arm encompassing shaft drive. The Paralever mounts directly to the frame instead of to the gearbox as on earlier oilheads. A reviewer reported: “The result is greater frame rigidity and better handling".
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