BMW R 1100 S - 2005 Specifications and Reviews
The 2005 BMW R 1100 S is a sport-touring boxer that appeals to riders seeking comfort with spirited performance. Its 1085cc twin-cylinder engine delivers smooth power and excellent torque for highway cruising and canyon carving alike. Known for reliability, handling balance, and that distinctive BMW boxer character, it remains a favorite among experienced sport-touring enthusiasts.
About the BMW R 1100 S
Powered by an air and oil cooled 1,085.00cc Boxer flat twin cylinder four stroke engine, producing 98bhp.
The engine is derived from the R1100RS although the compression ratio has been tweaked along with changes to the air intake and forged connecting rods to increase the top speed and power.
Power is delivered to the rear wheel via shaft drive and the engine is a stressed member of the frame, just like the R1100RS
The look is unique with the single sided swingarm, low down Boxer engine, dual under seat exhaust system and asymmetrical headlights.
Optional extras include 12V socket, 5.5" rear wheel (+0.5") with 180/55 tyre, engine spoiler, sports suspension set-up, tall screen, high handlebars, 2-level heated grips, hard panniers and ABS II.
Timeline
2002: Front discs were enlarged to 320mm.
BoxerCup Replica (2003): Main differences over the base bike are a revised fourth gear ratio from, wider 5.5" rear wheel with 180/55 tyre, engine spoiler, 60mm higher seat, Metzeler Sportek M1 tyres and Laser exhausts. Like the racing machines it also has a raised chassis with longer spring struts and Carbon Fiber Reinforced Plastic (CFRP) cylinder head covers.General information | |
| Category | Sport touring |
| Year | 2005 |
| Model | BMW R 1100 S |
| | |
Engine and Transmission Specifications | |
| Clutch | Single-disc dry clutch, hydraulically operated |
| Transmission typefinal drive | Shaft drive (cardan) |
| Gearbox | 6-speed |
| Cooling system | Oil & air |
| Starter | Electric |
| Fuel control | SOHC |
| Valves per cylinder | 4 |
| Fuel system | Injection. Electronic intake pipe injection/digital engine management: Bosch Motronic MA 2.4 with overrun fuel cut-off, twin spark ignition |
| Bore x stroke | 99.0 x 70.5 mm (3.9 x 2.8 inches) |
| Compression | 11.3:1 |
| Torque | 97.00 |
| Power | 96.55 |
| Stroke | 4 |
| Engine type | Two cylinder boxer |
| Capacity: | 1085.00 ccm (66.21 cubic inches) |
Physical measures and capacities | |
| Wheelbase | 1,478 mm (58.2 inches) |
| Overall width | 880 mm (34.6 inches) |
| Overall length | 2,180 mm (85.8 inches) |
| Overall height | 1,160 mm (45.7 inches) |
| Seat height | 800 mm (31.5 inches) If adjustable, lowest setting. |
| Weight incl. oil, gas, etc | 229.0 kg (504.9 pounds) |
| Dry weight | 208.0 kg (458.6 pounds) |
| | |
BMW R 1100 S dimensions and frame | |
| Rear brakes diameter | 276 mm (10.9 inches) |
| Rear brakes | Double disc |
| Front brakes diameter | 305 mm (12.0 inches) |
| Front brakes | Double disc |
| Rear tyre dimensions | 170/60-ZR17 |
| Front tyre dimensions | 120/70-ZR17 |
| Rear suspension travel | 135 mm (5.3 inches) |
| Rear suspension | Die-cast aluminium single-sided swinging arm with BMW Motorrad Paralever |
| Front suspension travel | 35 mm (1.4 inches) |
| Front suspension | BMW Motorrad Telelever |
| Trail | 100 mm (3.9 inches) |
| Rake (fork angle) | 25.0° |
| Frame type | Three-section composite frame consisting of front and rear section, load bearing engine. |
Speed and acceleration | |
| Power/weight ratio | 0.4642 HP/kg |
Other specs | |
| Maintenance | Find parts, fluids, filters, maintenance tools and service items on eBay |
| Fuel consumption pr. 10 km (6.2 miles) | 4.30 litres (1.14 gallons) |
| Fuel capacity | 18.00 litres (4.76 gallons) |
Performance Profile & Rider Fit
Best For
Rider Profile
| Best For | Best suited to intermediate or experienced riders who can appreciate the boxer engine's distinct character and shaft-drive handling quirks. |
| Purpose | Designed as a sport tourer, blending brisk boxer-twin performance with long-distance comfort and shaft-drive practicality. |
| Rider Fit | The 800mm seat height and moderate 229kg wet weight make it manageable for most adult riders, though the low-speed maneuvering requires some confidence. |
| Character | A quirky, characterful machine with torque-rich boxer power delivery, Telelever front suspension feel, and sporty yet composed road manners. |
| Not Ideal For | Not a good fit for off-road adventures or riders seeking a lightweight, flickable city commuter. |
Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.
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