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It all began with a small motorcycle workshop in Hamburg. Since then, Louis has become Europe's largest motorcycle and leisure retailer. And even now, after more than three quarters of a century, we at Louis are no less passionate about life on two wheels.

Various types of modern vehicle accessories now often carry an "E" mark that is valid throughout Europe. The "E" mark, a combination of numbers and letters, is clearly visible on the product and provides information about the tested area of application, the country in which the test was carried out, and, if applicable, the vehicle type for which the approval applies. EC type approvals for exhaust systems, for example, are always vehicle type-specific, while those for lighting equipment apply to entire groups of vehicles, such as motorbikes.
The legislator has designated this test mark as the sole proof of legality, i.e., a written report is not required, nor is registration necessary. In addition, however, the applicable guidelines of the StvZO (German Road Traffic Licensing Regulations) must always be observed during installation.
During a traffic check or at the general inspection appointment, the vehicle owner has fulfilled their obligation to provide proof by presenting the test mark. The inspecting officer is then free to check the test mark via the KBA in Flensburg, where all test marks can be decoded.

Original parts on newer vehicles that are factory-fitted with an E-mark may only be replaced with accessories that are also E-approved. For example, an E-approved mirror may not be replaced with one that only complies with German registration law.

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