Open to all riders from the year of their 16^th birthday. Limited to air-cooled engines of Chinese CAG origin and Chinese CAG type bikes. Modifications may be made provided that all parts are of Chinese origin / homemade and/or intended for use on commonly accepted Chinese CAG type bikes. There will be no horsepower restriction. The capacity of the motor may not exceed 50cc. Tires can be with or without pattern and of any manufacturer. Brake levers may be switched from their factory fitted side, but front and rear brakes must operate independently of each other and no single lever may control more than one brake disk. The use of hydraulic brakes is prohibited.