Fatbikes, with those typical wide tires, are impossible to imagine the streets without. For some, it is a status-enhancing means of transport, or simply a relaxed, sturdy bike. For others it is a specter on the road: a menacing and fast bike where an accident seems to be in a small corner. Accidents involving especially young people on fatbikes are often in the news. Does that sense of danger match the reality? Is a fatbike actually a bicycle or a motor vehicle? And what's the legal situation when things go wrong? In this blog, I write more about the position of the victim. That can be either the driver of the fatbike, another hit-and-run road user, or next of kin of a killed victim. Research shows ... First, a few facts about this wide-banded vehicle. On behalf of the Ministry I&W, research was conducted by Mobycon in 2025. It shows that: Fatbikes are popular among young people because a helmet and driver's license are not required. Fatbikes are cheap and often a status symbol. There are more and more of them in traffic. Information sourced from hospital emergency departments (ERs) shows that fatbike accident injuries are rising sharply since 2023. Young people on fatbikes are more likely to exhibit risky behavior than adults, increasing the likelihood of accidents. More than half of fatbike users ride faster than the allowed 25 km/h. That 15% appears to be riding a souped-up bike. Brain injuries often occur in fatbike accident victims. Accident with a fatbike, who is liable? Riding a fatbike is allowed at any age and without a helmet, because by law it is equivalent to an electric bike. By default, a fatbike has no more power than 250 watts and pedal assistance up to 25 km/hour. So it is not a motor vehicle, as a speed pedelec is. As the driver of a fatbike, taking out insurance is not mandatory (but it is desirable!). This does not mean that the driver of a fatbike cannot be liable or should not have to pay compensation in a traffic accident. Suppose Dax rides a fatbike through a red light and hits a pedestrian who is not at fault in traffic. Then Dax is liable for the damages suffered by this pedestrian. The insurance company may reimburse damages, but Dax will have to pay for this himself without insurance (or at a young age, his parents will vouch for this). If the pedestrian or cyclist (also) made a traffic error himself, Dax may still be liable and may have to pay some of the damages. Suppose Dax is the one who suffers brain damage because he is hit on his fatbike by a motor vehicle such as a car. The car does have compulsory WAM insurance and is also liable. If there is no force majeure, the motorized person will have to compensate at least 50% of the damage to Dax. If Dax is younger than 14, it is even 100%. Thus, damages must also be compensated (in part) if Dax himself made a traffic error, because Dax