We refined our original design with the AF1 in every way we could possibly imagine to deliver game-changing performance. With our crowning achievement, being a proprietary casting process in which the molecules of our aluminum are far smaller and more uniform in shape. This creates a 70% stronger integral structure of our aluminum. Together with new SCM440 steel axles and a true T6 heat-treating the AF1 is quality without compromise. Patent pending rethreading axle nuts, refined bushing and washer shapes for improved suspension, hand-pourred 96a pivot bushings. and machine-faced hanger end for precision bearing race contact. All of these features, with the geometry you know and love.