Frame shorten Cafe Racer Bobber Scrambler SwitzerlandCategoriesEverything about the law & motorcycle
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Motorcycle frame works

Welding work on the frame, sports air filter, changing rear frame, sport exhaust and license plate holder

What technical changes are allowed on motorcycles in Switzerland? This question is not always easy to answer. What is the Bible for believers are the ASA guidelines 2b for us bikers. In the guidelines, which have been developed by the Federal Office of Roads and Transport, all technical changes to motorcycles are looked at in detail. Among the most important information for hobby screwdrivers and professional bike builders are in particular the necessary documents about a problem-free re-registration of the road. You can find all this and much more information in this biker bible.

Although it deals with all technical changes to motorcycles in Switzerland, we want to go into specific questions in more detail. Important: If you still have unanswered questions despite our comments, you can contact us at any time.

Even better: Use the comment function and help everyone else who is interested in this topic. We are also happy to answer any questions about the comment function.

Your Blackdiamond Motorcycles Team

Can I weld on the frame, cut off brackets or drill holes?

Whether you shorten the frame as in the DTC report for BMW K75, K100, K1100 and K1, remove a bracket or drill a hole – in these cases, a DTC expert opinion is ALWAYS necessary for registration on the MFK or legal use on the road.

You can have such an expert report prepared at the DTC in Vauffelin. The costs amount to at least 6,500 CHF, as the process for verification is very complex. Electronic strain gauges (DMS) are used to demonstrate whether the strength of the frame can still be guaranteed.

We had this checked in the expert report for the R and K series from BMW. So you don’t have to worry about it anymore and you can buy the expert opinion from us without any further effort.

Sports air filter on motorcycle

Cafe Racer Shop Schweiz BMW Boxer R80 R100 K100 K1100 DTC Gutachten
Without DTC expert opinion, sport or mushroom air filters are unfortunately not allowed on motorcycles in Switzerland,as they influence the noise behavior of your motorcycle. If you want to install sports air filters, you have to have a noise measurement carried out at the DTC, which costs approx. 600 CHF.

Don’t worry: If you buy a converted R from us, the sports air filters are entered in the ID card 😉

Cafe Racer Shop Schweiz BMW Boxer R80 R100 K100 K1100 DTC Gutachten
BMW K100 Cafe Racer Auspuff kaufen

Sport exhaust

BMW K100 Cafe Racer Auspuff kaufen

You can replace the exhaust on the motorcycle at any time – but it is important that you have a corresponding CH suitability declaration and THAT EXACT your vehicle type and engine type are listed in the ABE of the exhaust manufacturer.

If you want to install an exhaust without corresponding Swiss papers, you must also have a noise measurement carried out in the DTC, depending on the canton. Such a measurement can cost up to 4,000 CHF.

Mounting the license plate on the side

You may mount the license plate on your motorcycle on the side, as long as the angle of inclination does not exceed 15° and is completely visible from both sides of the motorcycle.

Image sources

Cover blog post: Black Diamond Motorcycles

Post image DNA air filter: Black Diamond Motorcycles

Cafe Racer tyres for sale Switzerland BMW K100CategoriesEverything about the law & motorcycle
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Rims, tires, shock absorbers

Wide tires, other rims and shock absorbers

What technical changes are allowed on motorcycles in Switzerland? This question is not always easy to answer. What is the Bible for believers are the ASA guidelines 2b for us bikers. In the guidelines, which have been developed by the Federal Office of Roads and Transport, all technical changes to motorcycles are looked at in detail. Among the most important information for hobby screwdrivers and professional bike builders are in particular the necessary documents about a problem-free re-registration of the road. You can find all this and much more information in this biker bible.

Although it deals with all technical changes to motorcycles in Switzerland, we want to go into specific questions in more detail. Important: If you still have unanswered questions despite our comments, you can contact us at any time.

Even better: Use the comment function and help everyone else who is interested in this topic. We are also happy to answer any questions about the comment function.

Your Blackdiamond Motorcycles Team

Which types /dimensions can be installed in Switzerland?

You can change the tyres of your motorcycle at any time – but there are individual points to consider.

  1. The speed index of your motorcycle type must be adhered to (you can find the info in the type approval – best ask the vehicle manufacturer)
  2. Radial and diagonal tyres must not be mixed
  3. For cross tyres with M+S marking, a special rule applies: the speed index does not have to be adhered to here – but they must be able to drive at at least 130 km/h. In this case, the maximum speed with a sticker can be clearly displayed in the area of the driver.
  4. The roll-off circumference of your tyres must not change more than 8 compared to the original tyres. You can
    calculate
     this here, for example.
Cafe Racer Reifen kaufen Schweiz BMW K100

Rims from the accessories?

Cafe Racer Reifen kaufen Schweiz BMW K100

You may convert the rims of your motorcycle at any time. However, it is important that you use rims from renowned manufacturers such as Kineo and buy them in Switzerland. For a problem-free registration on the MFK, a CH suitability declaration is necessary. Of course, the wheels to the frame or other components of your motorcycle must be guaranteed at all times.

Lowering or raising motorcycles, can I?

Yes! You may. In any case, however, you need a CH suitability declaration based on an ABE from the manufacturer. If you want to lower or lower the vehicle, it should be noted that the total length of the strut does not change more than 3 cm compared to the original. If the 3 cm with your desired struts can no longer be adhered to, you need a DTC expert opinion.

Our DTC report for the BMW R models covers the longer struts. More information can be found here.

Welding motorcycle frame, changing sports air filter rear frame

BMW R80 Sitzrohr schweissen
You want to shorten or weld your motorcycle frame? Or are you interested in the typical mushroom air filters on motorcycles? In our next blog post, you will find sweating, sports air filters and rear frames for helpful information.
BMW R80 Sitzrohr schweissen

Image sources

Cover blog post: Black Diamond Motorcycles

Post image BMW R100 Detailed view: Black Diamond Motorcycles