Amsterdam is beginning to ban electric “fat bikes” in crowded areas due to increasing safety concerns. These bikes, capable of speeds exceeding 50 km/h, pose risks to both riders and pedestrians. The debate over their regulation is growing, with Paris potentially following Amsterdam’s lead. Concerns center on the bikes’ power and speed, making accidents more likely and more severe. Authorities are grappling with balancing the popularity of these vehicles with public safety. The increasing incidents involving fat bikes are prompting calls for stricter rules and enforcement. This situation highlights a broader challenge for cities adapting to new forms of micromobility.