Medienberichte und Publikationen rund um Fahrräder, Pedelecs, Technik und Sicherheit

Die häufigsten Sicherheitsrisiken, die uns in der täglichen Arbeit rund um Fahrrad-Sicherheit, -Technik und -Bedienungsanleitungen auffallen, publizieren wir auch in Artikeln in den führenden Fachmagazinen TOUR – Europas Rennrad-Magazin Nr. 1, BIKE – Das Mountainbike Magazin Europas Nr. 1 und E-Bike – Das Pedelec-Magazin, um diese für die Branche wichtigen Informationen einer größeren Öffentlichkeit zugänglich zu machen.

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Darüber hinaus sprechen wir regelmäßig in unabhängigen Fachvorträgen über alle Bereiche der Fahrradtechnik und des Fahrradmarktes. Auch weitere Fach- bzw. Branchenzeitschriften sowie immer häufiger Radio und Fernsehen zitieren uns in ihren Medienberichten und zeigen uns, dass wir mit unseren Hinweisen genau richtig liegen. In der Rubrik AKTUELL erfahren Sie laufend alle Neuigkeiten aus unseren Fachbereichen. Diese Berichte und Publikationen sortieren wir für Sie chronologisch bzw. nach Interessensgebieten.

BIKE 04/2019
Reading time 2:00 minutes

BREAKAGE BALANCE

Dirk Zedler, graduate engineer, expert witness for bicycles and e-bikes, about the handlebar/stem test in BIKE 04/2019

Six among the stems failed, ten among the handlebars. These are the typical weak points every biker should check regularly.

1. It is either the screws or the handlebar or fork steerer clamps that break. Therefore, check the clamping areas for cracks regularly 2. Every handlebar area wrapped or clamped can generate a breakage. In the case of the Beast Flatbar there was a breakage at the brake lever clamp. Therefore, be sure to use a torque wrench for tightening fittings with the torque wrench and only in a way that they do not turn during the ride. 3. Further weak points are bendings. The FSA SL-K broke three times in the same area. 4. Narrowing can also be the weakest link in the chain. The Truvativ-Kyle-Strait aluminium handlebar cracked three times close to the stem clamp.

Health is valuable, safety an expensive commodity. As expert witnesses we know that MTB handlebars and stems have caused the crashes of many cyclists in the past years, some of them with partly dramatic consequences. In the mid 90s already the special interest magazines of the German publishing house Delius-Klasing Verlag showed a reaction and conducted basic research together with universities. The research resulted in a first serious mountain bike handlebar test published in the October issue 1995 of BIKE.

The current test is based on these findings. Further theses were continuously assigned in cooperation with universities and the test procedure was permanently adjusted to the sport which developed and differentiated at a rapid pace. The tests not only focus on the level of forces measured, but also on the question how often will an incident act on a handlebar during its service life. The test that we conducted for BIKE not only considers typical cross-country or marathon rides, but also failed riding manoeuvres, drops and hard jumps. We assume in particular that a mountain biker will not replace his sinfully expensive handlebar after having gone down. For this reason usual falls are considered. In my opinion the test results are a complete success, because more and more manufacturers create a dense quality at highest level to the benefit of the mountain bikers.

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