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Professional racing simulator cockpit chassis are generally able to handle high-grade controls and are also able to accommodate secondary components such as hand brakes, switch panels, fans for wind simulation, and multiple screen options. Additionally, these driving sim cockpits have the structural integrity to stand up to the heavy loads exerted on professional level wheels and pedals. A motion element is often an option on professional grade racing simulators. Motion can range from subtle vibrations to full on pitching and rolling, while some of the better motion systems lie somewhere in between. Ricmotech has created the AP-Xtreme series of racing simulator chassis and most of the line is categorized as professional grade. A professional grade racing sim chassis often incorporates a real racing bucket seat or lets you provide your own.