The top speed of a 500cc street bike can vary depending on various factors such as the bike's make and model, its aerodynamics, weight, engine performance, and gearing. Generally, a 500cc street bike can reach a top speed of around 100-120 miles per hour (160-193 kilometers per hour). However, it's important to note that riding at high speeds can be dangerous and may be illegal on public roads. Always prioritize safety and adhere to speed limits and traffic regulations.