All about bicycles, pedelecs, technology and safety in the press

In our daily work as we deal with bicycle safety, technology and user manuals we come across lots of safety risks. The most frequent ones are published in articles of the leading German special-interest magazines TOUR – Europas Rennrad-Magazin Nr. 1, BIKE – Das Mountainbike Magazin Europas Nr. 1 and E-Bike – Das Pedelec-Magazin to make this information important for the sector accessible to a wider public.

For many years now the Eurobike Show Daily accompanying the annual international Eurobike Show has given us the opportunity to publish our perspective on major developments in the cycle industry in full-page articles.

We also speak regularly in independent lectures about all topics relating to bicycle technology and bicycle market. In addition, we are regularly cited by further special-interest magazines or trade journals as well as more and more by radio and television and in their media reports, which shows us that we are completely right with our information. The section NEWS informs you about the latest news from our specialist fields. The reports and publications of this section are listed chronologically or according to topics of interest.

E-Bike

E-bikes/pedelecs, bicycle technology and safety: in the past years the media have placed particular focus on electric bicycles. This section provides all media reports and publications of Zedler-Group on this topic. Also, please find below the latest guidelines for the parts replacement of e-bikes/pedelecs 25 kmh, 45 kmh as well as the guidelines on retrofitting bicycles with e-drives and on pedelec/e-bike 25 tuning for download.

TOUR 11/2020

Milestones

Specialized S-Works Tarmac SL7 and Canyon Aeroad CFR currently represent the pinnacle of competition road racers. They are both at the provisional end of a long series of memorable bikes that set standards in their time. A review of 25 years of TOUR test history that also shows how the view of the road bike has changed over time.

A road bike must be lightweight and aerodynamic. If the frame is also reasonably comfortable and stable enough to keep the carriage stubbornly on track even at a speed of 70 km/h, then you are dealing with a top of the line road bike, probably all road racers would agree on that. But when is a road bike the best of its class? The answer to this question depends not least on what criteria a road racing bike is judged by in the first place.

When TOUR started systematically recording and evaluating road bikes a bit more than 25 years ago, no one thought that it would one day be a matter of course to measure the aerodynamics of competition road racers in a wind tunnel. Nor was any particular attention paid to comfort initially, the measurable differences being hardly worth mentioning at that time.

The foundation for what became later the first and to this day the most comprehensive objective test procedure for road racing bikes was laid by the unforgotten Hans-Christian Smolik in the 1980s. As a columnist for the TOUR magazine and author of numerous specialist books on bicycle technology, he carried out basic research at the time which continues to have an impact today. In 1987, he developed among other things a method which made it possible to measure not only the vertical compliance, but also the lateral torsion of a frame, as a measure of directional stability and the bike’s tendency to wobble. However, the conclusions to be drawn from the measured values were largely left up to the readers.

THE FOUNDATION OF THE TEST HISTORY

This changed seven years later. In TOUR 11/1994 the two engineers and technical editors Robert Kuehnen and Dirk Zedler presented a test stand measuring the distortion of the frame’s front triangle towards the rear triangle. Not foreseeable at the time: This test stand made TOUR engineering history. Even today, many road bike manufacturers measure the riding stability of their frames with exactly this measuring method. For the TOUR special issue “Bike workshop 4 – frames” published in 1995, 49 framesets made of steel, aluminium, titanium and carbon were tested on the test stand for a large-scale comparative test. The test criteria not only include weight and stiffness in headtube and bottom bracket, but also the mechanical paint and the processing quality. Each of these characteristics are rated with marks ranging from “very good” to “not sufficient”.

The sole winner is the Quantum pro aluminium frame from the US manufacturer Klein, which was named "champion of all classes" by the testers and leads the rankings for weight and headtube stiffness. Well after the turn of the millennium, and basically to this day, the Quantum pro is still considered the benchmark for what is technically feasible with aluminium in frame construction. In the same test the Trek OCLV 5500 as best carbon frame ranks third in the weight ranking after all. The frames of the first OCLV generation were not very stiff at that time, but one could already make out the potential the material carbon was yet to offer in frame constructions.

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Author: Manuel Jekel
Photo: TOUR


If you want to read the entire article, order the respective issue from Delius Klasing Verlag online.

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