alum bends. At least the composites hold shape. When I ran 8th scale tweaked chassis sucked and were never cheap. My last 22, had a warped chassis also. When I replaced the rear bulk head, I had to flex the chassis to get the holes to line up. So I sold the car as opposed to buying a new chassis. The new 22 2.0 is "supposed" to address all of the issues and make it consistent and fast, time will tell. I actually liked the feel of the rb6, but I really disliked the esc location. Was hard to replace sensor wires without yanking the esc.