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|ignition = Electronic fuel injection, Bosch Motronic MA [[dual ignition]] (after 2003)
|transmission = 6-speed, shaft drive, dry clutch
|frame = Three section composite frame consisting of front & rear section, load bearing engine<ref
|suspension = Front:[[Telelever]]<br>Rear: [[Paralever]]
|brakes = Front: Dual {{convert|320|mm|abbr=on}} disc, 4-pot caliper<br>Rear: Single disc {{convert|276|mm|abbr=on}}<br>Optional [[Anti-lock braking system|ABS]]
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The '''BMW R1100RS''' is a [[sport bike|sports]] [[motorcycle]] that was manufactured by [[BMW Motorrad]] between 1999 and 2005. Introduced some 25 years after the [[BMW R90S|R90S]], the company's first sports bike, the R1100S was the first BMW bike having [[Motorcycle handlebar#Types of handlebar|clip-on handlebars]], rearset footrests and a removable cowl to cover the pillion seat.<ref name=bmwhistory/> Producing nearly 100
==Design==
The engine is a [[flat-twin engine|flat-twin]] "[[oilhead]]" that has [[air cooling|air-cooled]] cylinders but [[oil cooling|oil-cooled heads]]. Derived from the [[BMW R1100RS]], the 1,085 cc [[Fuel injection|fuel-injected]] [[Multi-valve|eight-valve]] engine is tuned for a maximum output of {{convert|98|hp|kW|}} at 8,400rpm.<ref
In addition to using the engine as a [[Motorcycle frame#Stressed member|stressed member]], the R1100S has a composite aluminum frame to which the suspension components are attached. The front suspension is BMW's [[patent]]ed [[History of BMW motorcycles#Telelever fork|Telelever]], with long [[telescopic fork|telescopic fork sliders]] containing neither springs nor damping. In order to minimize [[Suspension (motorcycle)#Brake dive|"fork dive"]], braking forces are taken back to the frame ''via'' a pivoting wishbone. A [[monoshock]] on this wishbone copes with springing and damping.
A detachable tubular [[subframe]] supports the rider and passenger. The R1100S has a very substantial half fairing which completely envelops the alloy fuel tank. Both the hugger and front fender are made of carbon-fibre. The two-into-one exhaust feeds twin silencers tucked up high beneath the pillion seat, like those on the [[Ducati 916]].<ref name=what2004/> Factory options originally available from BMW included electrically-heated grips, [[Anti-lock braking system|ABS]] brakes and a belly-pan fairing.<ref name="motorbikestoday"/>
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The R1100S is {{convert|27|kg|abbr=on}} lighter and {{convert|8|hp|kW|abbr=on}} more powerful than the [[BMW R1100RS]] from which it was derived, but at {{convert|229|kg|abbr=on}} (wet), it can in no way be considered a lightweight! Nevertheless, ''What Bike?'' magazine stated: "With underseat exhaust and plenty of ground clearance, the BMW is helped by the lack of dive under braking and makes up metres on the entry to corners. Mid-corner speed is superb, but it's on the exit that the air-cooled twin shows its short legs. Stick to the road, though, and the R1100S is a great place to be".<ref name=what2004>{{citation|journal=What Bike?|date=Summer 2004|publisher=[[Bauer Media]]}}</ref>
''[[Motor Cycle News]]'' (''MCN'') later reviewed the R1100S, stating: "The BMW R1100S is now starting to be regarded as something of a classic, especially in BoxerCup form. Classy styling, [[Honda VF and VFR|VFR]]-esque comfort and versatility plus BMW quality and residuals make for a stonking and attractive all-rounder, if not quite the sports bike BM intended…".<ref>{{cite web|url=http://www.motorcyclenews.com/bike-reviews/bmw/r1100s/1999/|title=BMW R1100S (1999-2005) Review|publisher=MCN}}</ref>
==Special editions of the BMW R1100S==
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A special edition model was the '''R1100S Sport''', which was a standard R1100S fitted with an optional "Sport" pack comprising stiffer suspension ''via'' a taller rear monoshock, a steering damper, and a wider rear wheel and tyre.<ref>Haynes Manual - "BMW 850,1100 & 1150 4-valve twins" page 0.9</ref> ''Bike'' magazine commented: "The basic R1100S is good value, but we're not convinced that the high spec Sport version offers any real benefit for road riders".<ref>''Bike'' magazine July 2002 page 51</ref>
A more expensive track-day version of the BMW R1100S, the '''BoxerCup Replika''' (or "BCR"), was available from 2003-2005. This had a pair of Laser under-seat exhausts fed from a single link pipe from the catalyst can, braided brake lines, carbon-fibre cylinder head protectors, an expensive carbon fibre, oil-catcher bellypan, uprated [[Öhlins]] suspension, and a shorter paralever torque arm which raised the rear end to quicken the steering and increase cornering clearance.<ref>{{cite web|url=http://www.visordown.com/reviews/motorcycles/sportsbikes/bmw-r1100s-boxercup-replika-2003---2005/35.html|title=BMW R1100S BoxerCup Replika (2003 - 2005)|work=Visordown|accessdate=21 December 2014}}</ref>
The BCR came with a standard engine management chip which was changed for a modified chip at the first dealer service. Despite the different chip, the Replika claimed no more power than the standard R1100S nor the Sport.<ref name=what2004/>
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