Wich model for my BMW Boxer conversion

SE (Sport-Evolution) Motorcycles
 is a motorbike factory based in Koblenz on the Rhine. It’s all about motorbike conversions, motorbike custom parts or ready motorbike modification parts.

BMW Concept Bikes: in our halls, every year, about 25 SE Concept Bikes are created. These include individually constructed Custom-Bikes. The main theme are the BMW R 45, BMW R 65, BMW R 80 or BMW R 100 models, which can be converted to a stylish Cafe Racer, Scrambler, Roadster or Bobber. The BMW R models are completely restored and rebuilt.
BMW custom parts:
Besides the construction of custom bikes we develop and produce many parts for motorcycle conversions like fork yokes, battery boxes, rear frames, suspension kits, rear frame conversions, front modifications, ignition systems, wiring harness, handlebar switches, mudguards and much more.
BMW Online Shop:
Our Sport-Evolution Online Shop, in the meantime, has reached a considerable size. We deliver daily with more than 90% delivery capacity. Every part sold in our online shop is used on our SE Concept Bikes. We know what we talk about.
Verified by the TÜV (MOT):
During 2017 Sport-Evolution has been verified by the TÜV/MOT Cologne, in order to be able to create part certificates for our parts with registration obligation. Our BMW fork yokes, BMW fork suspension systems, BMW rear frames and BMW rear conversions have a TÜV/MOT certificate and can be registered in any TÜV/MOT certification office without problems.
Technical support:
You have a BMW R 45, BMW R 65, BMW R 80 or BMW R100 and are planning a conversion to a BMW Cafe Racer, BMW Roadster, BMW Scrambler or BMW Bobber? Please get in contact with us, we’ll create for you a detailed motorcycle conversion concept with a reliable calculation. If you have any question about our BMW conversions, BMW custom parts or about their use, please give us a call or send an e-mail. We’ll be happy to support and advice you during your conversion project.


BMW R-series 2-cylinder boxer as the basis for the bobber conversion

In 1978 BMW had a severe sales crisis and was urgently looking for a new development. A motorbike prototype of the R80 was developed, which was to mark a new era with a sensational single-sided wheel suspension.
The single-sided swingarm "Monolever" with a corresponding rear wheel was convincing due to its torsionally stiff wheel guidance, low weight and also allowed easy wheel removal.
The R80RT was a street model that was cleverly assembled from existing components. Frame and instrumentation were from the R100. Engine, gearbox and rear wheel guide were from the R80 G/S. The R80 models were produced from 1984 to 1994 and are still very popular.
From 1987/88 onwards, the models were also equipped with the newly designed "Paralever" rear swingarm made of light alloy. For the first time in series production, the sometimes annoying starting torque and the pitching of the machine during sharp acceleration were effectively reduced. This was made possible by the use of a double-joint swingarm.
These two points, monolever and paralever, as well as the typical look of this generation of BMW motorbikes always enrapture us and make us go into high gear when designing them.
More motorbike conversions from Sport-Evolution

At Sport-Evolution Franzen GmbH, we manufacture not only BMW Bobbers but also other concept bikes. Individually built custom bikes with a focus on BMW R 45, BMW R 65,
BMW R 80 or BMW R 100 models, we convert them into stylish cafe racers, scramblers or roadsters. In addition, the BMW R models are completely rebuilt and lovingly restored. 


Which BMW series do we use for the scrambler conversion?

For the motorbike conversion to a scrambler concept bike, Sport-Evolution primarily uses BMW motorbikes from the R series as the basis for our conversions. Reliability, power and a throaty sound of the distinctive two-cylinder boxer engine still convince our customers today.
BMW R80RT Monolever (built from 1984 to 1995)
 The BMW R80RT is known as the little brother of the R 100RT and is an ideal basis for the conversion to a BMW Scrambler. There were a few modifications to the original model. The special feature of the monolever model is that a single-sided swingarm (monolever) was used instead of the rear swingarm. The aluminium filigree cast wheels were also fitted here. The rear end with seat, rear apron and side cover give the motorbike its distinctive and typical appearance. 
BMW R100R Paralever (built from 1991 to 1996)
Known as a naked bike, the R100R was mainly designed for the American market. We primarily use the paralever version for scrambler conversions. On BMW motorbikes with cardan drive, this ensures that the disturbing reaction forces of the cardan drive are reduced.
At Sport-Evolution Franzen GmbH, we not only manufacture BMW Scrambler concept bikes. Also other individually built custom bikes with the focus on BMW R 45, BMW R 65,
BMW R 80 or BMW R 100 models into stylish cafe racers, roadsters or bobbers. The BMW R motorbike models are also completely rebuilt and restored. 


Which BMW series are suitable for a cafe racer conversion?

For the conversion of a motorbike into a cafe racer, we prefer to use models from the BMW R and BMW K series. At Sport-Evolution, we primarily use BMW motorbikes from the R series as the basis for our conversions. The distinctive two-cylinder boxer engine delivers plenty of power, is reliable and still impresses with its throaty sound. 
Basic models of the R series:
BMW R45 (built from 1978 to 1985)
BMW R65 (built from 1978 to 1993)
BMW R80 (built from 1977 to 1995)
BMW R100 (built from 1976 to 1995) 
BMW motorbikes: A look back at history 
BMW (Bayerische Motoren Werke GmbH) has been building motorbikes since 1923. The first model in the history of the traditional Bavarian brand is the BMW R 32, which was developed by engineer Max Friz. The bike set standards even back then, which is why it is still an integral part of German motorbike history today.
The longitudinally mounted boxer engine with 2 cylinders was very flat and ensured a low centre of gravity, which benefited the riding characteristics - at least for the time. The R 32 was the basis for many other motorbike models of future generations. However, essential components such as the engine, transmission and chassis remained largely identical. The increase in displacement was mainly achieved by changing the cylinders or cylinder bores. 
Further motorbike conversions from Sport-Evolution 
BMW Scrambler
BMW Bobber
BMW Roadster