Wheel - Pro-Series - 6 x 6.5 in - 2.500 in Backspace - 3 x 2.50 in Bolt Pattern - Aluminum - Machined - Each. - About-Van-K Wheels has been producing aluminum karting and quarter-midget wheels since the 1970's. Based on Sullivan, Missouri, Van-K offers a variety of wheel sizes, styles, and finishes, all manufactured to the highest tolerances from American 6061-T6 aluminum.