Interview: Kristian Bauer
TOUR: Road bikes are tested according to IS0 4210 - are there separate specifications for gravel bikes?
Dirk Zedler: ISO 4210 differentiates between youth, city and trekking bikes, off-road bikes - i.e. mountain bikes - and racing bikes. There is no separate category for gravel bikes.
TOUR: As a buyer, how do I know whether my gravel bike can cope with difficult terrain with luggage?
Dirk Zedler: It is not possible to tell whether the gravel bike is up to the task just by looking at it or taking it for a test ride. Only test reports of all components from a European test centre can ensure certainty.
TOUR: In the current case, the carbon fork had a thinner wall thickness than identical models. Even a hard standard can't protect against that?
Dirk Zedler: Series variations are a major issue, especially with carbon fibre components. For more than 25 years, European legislators have therefore required random samples to be carried out in order to detect outliers in the series. A manufacturer should not rely on Asian suppliers, a "QC passed" sticker (editor's note) is quickly affixed. Therefore, a serious manufacturer must install its own quality assurance system to monitor the flow of goods. Without knowing the details and without having seen the fork myself, I would venture the following hypothesis: If it really was thinner than the forks of the same type, then it was probably also lighter. Simple weighing might have been enough to avoid the serious accident.
TOUR: As a consumer, how do I recognise whether my gravel bike or road bike is safe?
Dirk Zedler: Standards generally only define minimum requirements. For example, the ISO ends at a total weight of 100 kilograms, which is quickly exceeded on a gravel bike with rider and panniers. Standards often lag decades behind actual use and technology. TOUR first drew attention to breaking carbon fork steerer tubes in the February 2000 issue and subsequently again and again, but it was not until May 2023 that the updated ISO 4210 came into force. The test stipulated therein for this critical point does not provide sufficient safety, as we know from numerous accompanied damage cases and recalls as part of our expert activities. This means that a manufacturer must perform additional tests that go well beyond the standard anyway. To be clear: Many manufacturers work very seriously, test well above the standard and therefore offer safe bikes.
5.3 million euros in damages
A cyclist in England has reached a settlement following a serious accident involving a Planet X gravel bike. The manufacturer's insurance company awarded him the equivalent of 5.3 million euros in compensation. The plaintiff had suffered a serious fall and paraplegia due to the broken fork on his gravel bike. The bike in question was a Planet X Tempest SRAM Force 1 titanium bike with a carbon fork. According to an expert report, the wall thickness of the broken fork was significantly less than that of other forks of the same model. The accident happened on a grassy hill. The trial was delayed by the insolvency of Planet X 2023. The accident victim's lawyer criticised in a press release that, in contrast to long-standing test standards for racing bikes, mountain bikes and other bicycles, there are still no clear international test specifications for gravel bikes.
Kristian Bauer
Editor
