Chassis Engineering Frame Rails offer a great platform for any back half race car. Our 2 x 3 rails are offered in .083″ or .120″ thickness and are mandrell bent. Chassis Engineering round tube frame rails are mandrel bent and offered in 1-3/4″ for precision and smooth bends. All welded suspension brackets are laser cut from 1/4″ steel. 1-5/8″ Moly and mild steel round tube frame rails are available upon request.