EngineeringMechanical EngineeringBicycle PlanningBiomechanicsDynamical SystemsStabilityStability AssessmentStability CriteriaStatic StabilityVehicle StabilityBicycle ModelBicycle Path DesignBikeway GeometryStabilizing Mechanisms
Although most people can ride a bicycle, the underlying mechanics remain poorly understood and existing theories lack experimental validation. The study aims to uncover the subtle factors that confer stability to bicycles. The authors built modified bicycles missing specific components to isolate stabilizing features. Analysis of steering geometry and computational modeling led to the design of an inherently unstable bicycle, revealing key stability mechanisms.
ALMOST EVERYONE can ride a bicycle, yet apparently no one knows how they do it. I believe that the apparent simplicity and ease of the trick conceals much unrecognized subtlety, and I have spent some time and effort trying to discover the reasons for the bicycle's stability. Published theory on the topic is sketchy and presented mainly without experimental verification. In my investigations I hoped to identify the stabilizing features of normal bicycles by constructing abnormal ones lacking selected features (see figure 1). The failure of early unridable bicycles led me to a careful consideration of steering geometry, from which—with the aid of computer calculations—I designed and constructed an inherently unstable bicycle.