Positioning:
The R1100RT and R1100RS represented BMW's premium sport-touring and sport-touring/GT offerings in the 1990s, known for their robust engineering, boxer-twin engines, and long-distance comfort and performance.
Competitors:
Competed with other high-end touring and sport-touring motorcycles from marques like Honda (ST series), Yamaha (FJR series), Kawasaki (GTR series), and Ducati.
Model Features:
Characterized by the air/oil-cooled 1085cc flat-twin engine, shaft drive, Telelever front suspension for improved handling and comfort, and the optional ABS II braking system. The RT featured a full fairing and touring amenities, while the RS offered a more aerodynamic, sport-oriented fairing.
Engine:
Detailed breakdown of the R1100 series boxer-twin engine (engine code typically M257/M258), including cylinder head removal, valve adjustment, piston and ring replacement, crankshaft and connecting rod service, oil pump, lubrication system, and cooling system (air/oil). Specific coverage for fuel injection (Bosch Motronic MA 2.4) and ignition systems.
Transmission:
Complete service and repair procedures for the 5-speed manual transmission, including clutch operation, gear shifting mechanisms, internal gearbox components, and final drive (single-sided swingarm with shaft drive).
Electrical:
Extensive coverage of the electrical system, including wiring diagrams for all circuits, battery and charging system (alternator, regulator), starter motor, lighting (headlight, taillight, turn signals), instrumentation, horn, ABS II system (if equipped), and electronic control units (ECUs).
Chassis And Suspension:
Detailed procedures for front Telelever suspension, rear Monolever suspension, wheel bearing replacement, steering head bearing service, and shock absorber adjustments/replacement.
Brakes:
Comprehensive brake system service, including front and rear disc brake systems, brake caliper overhaul, master cylinder replacement, brake fluid bleeding, ABS II diagnostics and repair (if applicable).
Bodywork And Trim:
Instructions for fairing removal and installation, seat adjustment, fuel tank maintenance, and accessory fitment.
Maintenance:
Scheduled maintenance intervals, oil and filter changes, air filter replacement, spark plug replacement, valve clearance checks, drive shaft lubrication, brake fluid renewal, and general inspection routines.
Troubleshooting:
Diagnostic procedures for common issues, fault code interpretation (if applicable for the era), and systematic problem-solving for engine performance, electrical faults, and chassis issues.
Repair:
Step-by-step instructions for component disassembly, overhaul, reassembly, and adjustment for all major systems.
Specifications And Data:
Torque specifications for all fasteners, fluid capacities, electrical component specifications, engine timing data, and dimensional measurements.
Depth Of Coverage:
Full factory-level repair and diagnostic information, suitable for professional mechanics and experienced DIY enthusiasts. Covers everything from basic fluid changes to complete engine and transmission rebuilds.
Engine Type:
Four-stroke, horizontally opposed twin-cylinder (Boxer)
Displacement:
1085 cc (66.2 cu in)
Bore X Stroke:
99 mm x 70.5 mm
Valve Train:
SOHC, 2 valves per cylinder, pushrod actuated
Cooling System:
Air/Oil cooled
Horsepower:
Approximately 90 hp (67 kW) @ 7,250 rpm (claimed)
Torque:
Approximately 96 Nm (71 lb-ft) @ 5,500 rpm (claimed)
Fuel Delivery:
Bosch Motronic MA 2.4 Electronic Fuel Injection
Fuel Type:
Unleaded gasoline (95 RON recommended)
Fuel Tank Capacity:
25 liters (6.6 US gal)
Ignition System:
Electronic ignition with twin spark plugs per cylinder
Transmission Type:
5-speed manual
Clutch Type:
Dry single-plate clutch, hydraulically operated
Gear Ratios:
Specific gear ratios detailed in the manual (e.g., 1st: 3.41, 2nd: 2.17, 3rd: 1.56, 4th: 1.27, 5th: 1.03).
Length:
Approx. 2,230 mm (87.8 in) for RT, slightly less for RS
Width:
Approx. 900 mm (35.4 in) for RT (including fairing/mirrors)
Height:
Approx. 1,400 mm (55.1 in) for RT (including windscreen)
Wheelbase:
Approx. 1,477 mm (58.1 in)
Dry Weight:
Approx. 227 kg (500 lbs) for RT, 220 kg (485 lbs) for RS
Gross Weight:
Approx. 450 kg (992 lbs)
Safety Ratings:
N/A (Motorcycle safety is typically assessed by specific test bodies like ADAC or through rider experience, not formal crash ratings as with cars).
ABS System:
BMW Motorrad ABS II (optional, highly regarded for its era)
Braking System:
Dual front disc brakes, single rear disc brake
Lighting:
Halogen headlight, integrated turn signals, LED taillight.
Frame Construction:
Trellis frame made of steel tubing.
Infotainment Features:
While basic by modern standards, these models often featured advanced (for the time) integrated audio systems with handlebar controls and AM/FM radio. Some may have had CB radio integration or provision.
ABS System:
BMW's ABS II system was a significant technological offering, providing anti-lock functionality for both front and rear wheels, enhancing safety significantly.
Cruise Control:
Optional cruise control was available on many R1100RT models, a rarity in motorcycles of this era.
Connectivity Features:
Limited connectivity by modern standards. Diagnostic port for Motronic system was present, allowing for basic data retrieval.
Instrument Panel:
Analog tachometer and speedometer, with digital odometer, trip meters, fuel gauge, and warning lights. RT models often featured a comprehensive dashboard.
Oil Change Interval:
Typically every 10,000 km (6,000 miles) or annually, whichever comes first. Refer to manual for exact recommendation.
Valve Adjustment Interval:
Typically every 20,000 km (12,000 miles).
Spark Plug Replacement:
Typically every 20,000 km (12,000 miles).
Engine Oil:
SAE 15W-50 API SG or higher. Capacity approx. 4.0 liters (4.2 US qt) with filter change. Specific BMW oil grades may be recommended.
Transmission Oil:
SAE 75W-90 GL-5 gear oil. Capacity approx. 0.3 liters (0.3 US qt).
Final Drive Oil:
SAE 75W-90 GL-5 gear oil. Capacity approx. 0.18 liters (0.19 US qt).
Brake Fluid:
DOT 4 or DOT 5.1.
Common Wear Items:
Fuel pump, clutch slave cylinder, starter motor brushes, and fuel injector seals can be wear items requiring attention over time. Electrical connectors can sometimes corrode. ABS sensors may require cleaning or replacement.
Telelever Pivot:
The pivot points on the Telelever system may require periodic lubrication and checking for wear.
Fuel Line Fittings:
Early models might have had issues with fuel line quick-disconnect fittings; later replacements or aftermarket solutions address this.
Brand History:
BMW Motorrad has a long and storied history dating back to 1923, known for pioneering technologies like the boxer engine and shaft drive, and for producing durable, high-performance motorcycles.
Predecessors:
The R1100RT and RS evolved from the R100RT and R100RS models, representing a significant technological leap with the introduction of the 4-valve per cylinder engine architecture (though the R1100 series retained 2 valves initially), Telelever front suspension, and Motronic fuel injection.
Successors:
These models were succeeded by the R1150RT and R1150RS, which further refined the platform.
Production Period:
1993-2001
Manufacturing Location:
Berlin, Germany (Spandau plant)
Industry Awards:
While specific awards might be difficult to pinpoint for these individual model years, BMW motorcycles of this era were consistently recognized for their build quality, durability, and innovative engineering, particularly the introduction of ABS and Telelever suspension.
Magazine Reviews:
Contemporary reviews from motorcycle publications like Cycle World, Motorcyclist, and MCN generally praised the R1100RT and RS for their comfortable ergonomics, strong engines, capable chassis, and long-distance touring prowess, often highlighting the Telelever front end and ABS as standout features.
