BMW R100RT Mono (1987-89)

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The BMW R100RT Mono was a motorcycle produced from 1987 to 1989, equipped with a four-stroke, two-cylinder horizontally opposed Boxer engine and a capacity of 980 cc. The motorcycle had a maximum power of 43.7 kW / 60 hp at 7000 rpm, and a maximum torque of 74 Nm / 7.5 kgf-m / 54.6 ft-lb at 6000 rpm. It had a five-speed transmission with a dry single plate clutch and diaphragm spring. The final drive was a shaft mechanism, and the frame was a double sown tubs dual cradle. The front suspension included a telescopic fork with hydraulic shock absorber, while the rear had a monolever swinging arm. The front brakes were two 260 mm discs with two piston calipers, and the rear had a simplex 200 mm drum. The dimensions were 2110 mm in length, 746 mm in width, and 1465 mm in height, with a wheelbase of 1465 mm and a seat height of 820 mm. The motorcycle weighed 238 kg and had a fuel capacity of 24 litres. The consumption average was 5.1 L/100 km, and it could reach a top speed of 203 km/h.

Technical specifications:

Make Model: BMW R 100RT Mono

Year: 1987 – 89


Engine: Four stroke, two cylinder horizontally opposed Boxer, 2 valves per cylinder
Capacity: 980 cc 59.8 cu in
Bore x Stroke: 94 x 70.6 mm
Cooling System: Air cooled
Compression Ratio: 8.45:1
Lubrication: Wet sump
Induction: 2 x Constant depression carburettors, Bing 94/40/105 – 94/40/106
Ignition: Battery ignition
Alternator: Bosch 12V/240 W
Battery: Bosch 0.6 hp (from 1978: 0.7 Kw)
Starting: Electric
Max Power: 43.7 kW / 60 hp @ 7000 rpm
Max Torque: 74 Nm / 7.5 kgf-m / 54.6 ft-lb @ 6000 rpm
Clutch: Dry single plate, with diaphragm spring
Transmission: 5 Speed

Gear Ratio: 1st 4.4 / 2nd 2.86 / 3rd 2.07 / 4th 1.67 / 5th 1.50: 1
Gear Ratio Sport Version: 1st 3.38 / 2nd 2.43 / 3rd 1.93 / 4th 1.67 / 5th 1.50
Rear Wheel Ratio: 1:2.91 or 1:3.00
Bevel / Crown wheel: 11 / 32 teeth or 10 / 32 teeth
Final Drive: Shaft
Frame: Double sown tubs, dual cradle
Front Suspension: Telescopic fork with hydraulic shock absorber.
Front Wheel Travel: 200 mm / 7.8 in
Rear Suspension: Monolever swinging arm
Rear Wheel Travel: 125 mm / 4.9 in
Front Brakes: 2 x 260mm discs, 2 piston calipers
Rear Brakes: Simplex 200 mm drum
Front Wheel: 1.85 B 19
Rear Wheel: 2.75 C 18
Front Tyre: 3.25 H-19
Rear Tyre: 4.00 H-18
Dimensions: Length 2110 mm / 87 in Width 746 mm / 29.37 in Height 1465 mm / 57.67 in
Wheelbase: 1465 mm / 57.67 in
Seat Height: 820 mm / 32.3 in
Ground Clearance: 165 mm / 6.49 in

Wet Weight: 238 Kg / 525 lbs
Fuel Capacity: 24 Litres / 6.3 US gal
Consumption Average: 5.1 L/100 km / 19.6 km/l / 46 US mpg
Standing 1/4 Mile: 13.8 sec / 153 km/h / 95 mph
Top Speed: 203 km/h / 126 mph

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