Phil Hawksley's BM Bikes

'The Ultimate BMW Information Site'

   Contact Me

Find Information, Specifications and Images of Your Favourite BMW Motorcycle

Custom Search

About This Site
BMW Press Packs
BMW Model Spec
Engine/Chassis Nos
BMW Photos
Colour Schemes
Annual Colours
BMW Paint Codes
BMW Pin Stripes
BMW Colour Charts
BMW Price Guides
BMW Recall Notices
Mechanical Photos
The Black Museum
BMW Distributors
Clubs Worldwide
BMW Links
Your Help Required
Cookies & Copyright

BMW R100 Monolever Specifications


Back To Index

Details of this model are a little sketchy - BMW themselves do not list it and the chassis numbers used do not appear on the Parts CD. I understand that around 180 were sold in the US during 1990/91 but am not aware of this model being marketed anywhere else in the world - if you have information, please let me know. A copy of the BMW US Sales Brochure is shown at the bottom of the page. Thanks to Rob James and Richard Munoz for the information. Apparently this machines is referred to as an R100 Classic and the handbook supplied was for the R100RT. I have been informed by Marc Jan Compagner that this model was also sold in Japan. I now have what appear to be confirmation that this model was also sold in Japan as one has been spotted in an on-line auction there by Jeff Birtwistle.

The information that I have is that Chassis Numbers ran from 6419001-6419181.

Start of Production


BMW R100 Monoshock Photo

Click to View

End of Production


Numbers Produced






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)


980 cc

Max Power

60 hp (44 KW) at 6,500 rpm

Max Torque

74 Nm (58 ft lbs) at 3,500 rpm

Compression Ratio

8.45 : 1

Valves Per Cylinder


Valve Control

OHV, using push rod and rocker arm


42mm intake / 40mm exhaust

Valve Timing

(Measured at 2mm valve clearance). intake opens 16 before TDC, closes 44 before BDC; exhaust opens 56 before BDC, closes 4 after TDC

Carburation System

2 32mm Bing CV Carbs

Engine Lubricating System

Wet sump

Power Transmission



Dry single plate, with lever action diaphragm spring

Number of Gears


Gear Selection

Dog type gearbox (ratchet foot lever)

Gearbox Ratios

4.4 / 2.86 / 2.07 / 1.67 / 1.50

Rear Wheel Ratio

1 : 3.00


11 / 33 teeth


Electrical System


Ignition System

Contact free electronic ignition (Bosch)


Bosch 240 W, 14V


Bosch 0.7 Kw


12V, 25 ah battery



Type of Frame

Double loop tubular frame with bolt on rear section

Front wheel suspension

Telescopic fork with hydraulic shock absorber, 38.5mm stanchion tube diameter

Rear wheel suspension

BMW Monolever swinging arm with single gas filled shock, 4.8 in travel

Spring Travel Front/Rear

175 / 121 mm (6.88 x 4.76 in)

Wheel Rims, Front

MTH2 2.50 x 18 E cast alloy

Wheel Rims, Rear

MTH2 2.50 x 18 E cast alloy

Tyres, Front

90/90H x 18 tubeless

Tyres, Rear

120/90H x 18 tubelss

Brakes, Front

Dual disc brake 285 mm / 11.22 in diameter. Brembo 2 piston caliper

Brakes, Rear

Simplex drum brake 200 mm / 7.87 in diameter



Length x Width x Height

2175 x 800 x 1447 mm (85.6 x 31.5 x 57 in)

Wheel Base

1447 mm / 56.96 in

Fuel Tank Capacity

22 litres / 4.83 gal / 5.81 gal US

Unladen Weight

419 lbs dry; 485 lbs wet

Max. Permissible Weight

970 lbs

Seat Height (Unladen)

807 mm (31.8 inches)

BMW R100 Monolever Sale Brochure



Member of BM Riders Club, The BMW Club, BMF, BMWMOA, The Airheads and The Poverty Riders

Check out my other sites at: &