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.
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.
Ever heard about the locker or cabinet test? No? One of my colleagues at the German FREERIDE magazine likes to mention it as negative example when it comes to testing things. If one tested for example TV sets with the locker test, it would look like that: Take the TV sets to be tested and let them fall down the locker one after the other. The result: All TV sets get broken. Although there can be no doubting the result, the findings are for the use in practice utter nonsense.
In the case of component tests, as in our case handlebars and stems, a practice or field test cannot supply findings relating to the durability. It is extremely difficult to standardize test rides and the time factor would put a spoke in our wheel. Bringing our complete test field comprising 21 handlebar/stem-combinations, three items of each (to detect material deviations), to the limits would take decades.
With our two test fields (cross-country trail: handlebar width 725-760 mm and all mountain-enduro/downhill 770-815 mm) we therefore have to rely on the test stands of the independent test institute Zedler in Ludwigsburg, whcih can test handlebars in fast motion. Compared to the past test in BIKE 5/14 we did not change the established test procedure. First, a handlebar/stem-combination had to pass the ISO 4210:2015 test. Rather a show then a real hurdle, as weight and assembly of the loads have not much to do with reality.
THESE ARE THE TESTING METHODS OF BIKE
Our handlebar/stem-combinations were tested in accordance with both test standards ISO 4210:2015 and ADVANCED PLUS at the independent test institute Zedler. Three samples per manufacturer were tested to cover the series deviations. The final judgement is based on safety and weight.
The prelude to the test marathon was the ISO test. Contrary to the test conducted four years ago none of the brand manufacturers failed at this small hurdle. Then thetest samples still sound from the ISO test as well as two further samples per manufacturer had to pass the Advanced Plus test of the Zedler institute. The finely mixed multiload test is based on extensive real data and comprises different test blocks. For the best practice-oriented simulation possible fittings, such as brake levers, were mounted according to the manufacturers’ specifications. The loads of the Advanced Plus test are divided in in-phase and out-of-phase situations with various forces. Every 4000 load cycles were followed by four high out-of-phase loads simulating hard landings or falls. The test ended at 250000 load cycles, because from this value on handlebars are considered safe even in long-term, hard use.
Author: Peter Nilges
Photo: Henry Lesewitz
If you want to read the entire article, order the respective issue from Delius Klasing Verlag online.
Ossweiler Blaettle, 2019/03/28