The Dunkel Blau Commision

Technical Specification

Year 1977

Model R100RS

Displacement 1000cc (61 cu in)

Power 70hp (45kW)

Torque 56 ft⋅lbf (76 N⋅m) @ 5,000 rpm

Transmission 5 Speed

Forks USD Ohlins FGRT

Alternator Silent Hektik 12 V • 400 Watts

Spark Plugs Bosch WR6DC

Fuel Tank 4.76 US gal (22 l; 4 imp gal)

Tires Michelin Anakee Wild 110/90 18 front • 130/90 18 rear

Rims SUN 2.75 x 18 front • 3.25 x 18 rear

Starting with a first year BMW R100RS manufactured in 1977, we repaired and braced the frame along with removing the factory tabs before refinishing in a gloss black powder coat. We fitted our custom subframe with a flush mount brake light and turn signals. The front end consists of a pair of Ohlins FGRT USD forks mounted via a custom triple tree, whilst rear suspension is equipped with a pair of Öhlins shocks with external reservoirs. The exhaust is a full stainless system finished with a pair of quiet-core mufflers from Cone Engineering. The result is a refined street scrambler with modern handling characteristics, excellent brakes and ample power.

The original engine has been rebuilt with new European specification dome top pistons and a compression ratio of 9.5:1. The heads have been refurbished and dual plugged. A hi-output ignition system powers a pair of dual coils mounted under the gas tank and under the timing cover. The Mikuni carburetors have been jetted and tuned to suit. The factory airbox has bee retained and is original equipment to the R100RS. The starter was upgraded to a lightweight hi-torque unit to take less draw the from lithium battery, housed safely under the gas tank in our custom battery tray. The factory charge system was replaced with a modern upgraded unit

A /5 headlight bucket is mounted to a pair of Ohlins USD forks using custom fabricated fork ears in the style of the original items. Brakes consist of a pair of Brembo GP4 radial calipers with a nickel finish, operated by an under-tank master cylinder. The headlight has been modified to LED for brighter light and less draw on the battery.


The Speedometer has been rebuilt and customized, including orange pointers. The gauge incorporates a speedo, a tach and indicator lights. Hand controls are new OEM units, modified to suit the custom wiring harness.

A custom front hub is laced to an 18” Sun rim anodized black with stainless steel spokes. The rear utilizes the factory rear hub, converted to modern sealed bearings and laced to an 18” Sun rim. The gas tank, front fender and headlight bucket finished in Dunkel Blau Glasurit paint and wears original cloisonné roundels. Pinstripes are hand painted in off white in the original style.

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The Olive Commission

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The Palmer Commission