The maximum speed at which a motorcycle can go before falling over depends on various factors, including the design of the motorcycle, the rider's skill level, road conditions, and other environmental factors. In general, motorcycles are designed to maintain stability at high speeds, and modern sports bikes can reach speeds well above 150 miles per hour (240 kilometers per hour) without falling over.
Professional riders on closed racetracks with proper safety measures can achieve even higher speeds, but these conditions are controlled and optimized for high-speed riding.
The key to maintaining stability at high speeds lies in factors such as the motorcycle's aerodynamics, suspension, and tires, as well as the rider's ability to control the bike through proper body positioning, throttle control, and steering inputs. Manufacturers design motorcycles with stability and safety in mind, but it's crucial for riders to understand their bike's capabilities and operate within safe limits to avoid accidents.