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Home >> BMW Bikes Details >>BMW R100RS Bikes Specifications

BMW R100RS Bikes

BMW R100RS Bikes

Engine

Motor Type Four-stroke two cylinder horizontally opposed "Boxer" engine, air cooled
Bore x Stroke 94 x 70.6 mm (3.70 x 2.78 in)
Displacement 980 cc
Max Power 70 hp (51 KW) at 7,250 rpm
Max Torque 76 Nm / 56 ft lb at 5,500 rpm
Compression Ratio 9.5 : 1
Valves Per Cylinder 2
Valve Control OHV, using push rod and rocker arm
Carburation System 2 constant depression carburettors, Bing 94/40/105 - 94/40/106
Engine Lubricating System Wet sump

Power Transmission

Clutch Dry single plate, with lever action diaphragm spring
Number of Gears 5
Gear Selection Dog type gearbox (ratchet foot lever)
Gearbox Ratios 4.4 / 2.86 / 2.07 / 1.67 / 1.50 : 1 (Optional sport version: 3.38 / 2.43 / 1.93 / 1.67 / 1.50)
Rear Wheel Ratio 1 : 3.0 or 1 : 2.91
Bevel/Crownwheel 11 / 33 teeth or 11 / 32 teeth

Electrical System

Ignition System Battery ignition. From Sept 1980: contact free electronic ignition (Bosch)
Alternator Bosch 12V/240 W
Starter Bosch 0.6 hp (from 1978: 0.7 Kw)
Spark Plugs Bosch W 225 T 30 / Beru 230/14/3 A /Champion N6Y

Chasis

Type of Frame Double loop tubular frame with bolt on rear section
Front wheel suspension Telescopic fork with hydraulic shock absorber
Rear wheel suspension Long swinging arm with adjustable strut
Spring Travel Front/Rear 200 / 125 mm (7.87 x 4.92 in)
Wheel Rims, Front 1.85 B 19
Wheel Rims, Rear 2.50 B 18
Tyres, Front 3.25 H 19
Tyres, Rear 4.00 H 18
Brakes, Front Dual disc brake 260 mm / 10.23 in diameter. ATE 1 piston caliper up to 1981. 1981 models Brembo 2 piston caliper
Brakes, Rear Simplex drum brake 200 mm / 7.87 in diameter (from 1978: single disc brake 260 mm / 10.23 in diameter)

Dimensions/Weights

Length x Width x Height 2130 (from 1978: 2210) x 746 x 1300 mm (83.85 (or 87) x 29.37 x 51.18 in)
Wheel Base 1465 mm / 57.67 in
Fuel Tank Capacity 24 litres / 5.27 gal / 6.34 gal US
Unladen Weight with Full Tank 230 Kg / 506 lb
Max. Permissible Weight 398 Kg / 876 lb
Seat Height (Unladen) 820 mm (32.3 inches)
Ground Clearance 165 mm / 6.49 in
Fuel Consumption (at constant 90 Kph) 5.75 litres 100 Km / / 49 mpg / 40 mpg US
Top Speed 200 Kph / 124 mph
Acceleration 0 - 100 Kph / 0 - 62 mph 4.6 seconds