While almost all roller coasters have a strictly enforced weight maximum and height minimum for safety, a formal "weight minimum" for individual riders is exceptionally rare. In 2026, the primary concern for ride safety is that the restraint system (lap bar or over-the-shoulder harness) can firmly secure the rider’s body against the seat. If a person is too light or small, they may not meet the height requirement, which is the industry's proxy for ensuring the body is large enough to be safely contained by the harness. However, there is a technical "system weight" minimum: certain roller coasters require a minimum total weight across the entire train to ensure enough momentum to complete the circuit, especially in cold or windy conditions. This is why you might occasionally see water-filled "test dummies" used in empty seats during early morning testing to ensure the train clears the highest hills without "rollbacks."