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Documents for road approval (TÜV)
DTC certificates & custom parts
All about motorcycles

The long way from the base bike to a Black Diamond.

BMW R80 & R100 Bobber

The BMW R80/R100 models, produced in the 1970s, tell a story that is more than 40 years old – we are continuing this with a new chapter. In our small but fine factory near to Solothurn, the motorcycles are completely dismantled, restored and rebuilt. We consciously do without mass production and transform every basic bike (BMW R80 / BMW R100) into an absolute unique piece. Whether on the engine or on the frame, we replace every screw and replace every seal – All-in-One! YOU decide what your motorcycle should look like from us!

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All parts of the bike are glass bead blasted in advance, then powder-coated with high-quality paint. The tank is painted in a matching vintage style. The tank lining is handmade!

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Buy R100 Switzerland
Engine & Drive

The motor is completely revised and renewed except for the last screw or seal. The same applies to the manual transmission and the final drive. All or nothing!

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Attachments & Accessories

Our customers trust in quality - that's exactly what we do. All attachments and accessories are made by renowned manufacturers such as Kellermann or Motogadget.

Buy R100 Switzerland

The frame is adapted to the Bobber look. This means: CNC-milled and turned seat tube, water-cut suspension mounts and shortened fork.

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The best at the end: Street approved - everything registered in the EU! Incl. all DTC Swiss certificates for road approval!

Buy R100 Switzerland

As the only company in Switzerland, we have the approval of our self-built exhaust system in combination with open sports air filters.

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Your benefits

BMW R80 & R100 Bobber

100 % legal

Your safety is important to us – for this reason, all technical changes are checked and approved by government in Switzerland. 100 %!

Fixed price

No matter what surprises come to light during the conversion – the prices set at the beginning are fixed. We will be happy to respond to your wishes.


All custom bikes are completely frame-off rebuilt. Sit on it, start the engine and enjoy! You get an all-in-one package from us.

Swiss Quality

Beware of cheap, international bikes. The quality is not comparable to Swiss standards. We offer 100 % Swiss Quality!

Our latest custom bike

BMW R100 "Flying Spark"

BMW R100 Flying Spark
BMW R100 by Black Diamond Motorcycles
Tank BMW R100 Flying Spark
BDM Shorty Exhaust for BMW R100
BMW K100 BMW K75 BMW K1100 BMW R80 R100 Shop Switzerland

Parts n'More


BMW K100 BMW K75 BMW K1100 BMW R80 R100 Shop Switzerland

Are you building your dream Cafe Racer, Bobber or Scrambler by yourself? Then you need to view our online shop. In our shop you´ll find for example a CNC milled numberplate holder for the right side of your R-series BMW, a seat tube for 100 % Bobber-look and a lot of other parts for your custom bike. Take a look. it´s worth it!

BMW K75 & K100 | BMW R80 & R100

DTC certificate

Everything about the law and motorcycles.


Motorcycle conversion Switzerland what is allowed and what forbidden cantonal police Solothurn
Motorcycle conversion in Switzerland
How much does a DTC report cost? What can I convert on the motorcycle? You can find the conversion…
BMW K100 BMW S1000RR Fork conversion Steel flex brake lines Motorcycle
Conversion of the braking system
Everything about brake discs, brake cylinders and steel flex lines. Helpful information about this conversion area.
BMW R100 fork bridge exchange DTC expertise
Modifications to the steering device
Wide handlebar? Other fork bridge? Do I need one or two rear-view mirrors? And what about the speedometer?
LED blinkers change motorcycle Switzerland
Changes to the lighting
Can I install an LED headlight from Wish or Alibaba? What about blinkers? Do I need a cat’s eye?

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